Even though the fourth commandment is "Thou shalt not kill" God kills many directly himself or allows others to kill in his name.
First of all, there is Noah's flood, in which God massacred every single child and most men and women and most all the animals on the face of the earth.
Exodus chapter 12 verse 28, God writes about one of his early massacres:
So the people of Israel did just as the LORD had commanded through Moses and Aaron. And at midnight the LORD killed all the firstborn sons in the land of Egypt, from the firstborn son of Pharaoh, who sat on the throne, to the firstborn son of the captive in the dungeon. Even the firstborn of their livestock were killed. Pharaoh and his officials and all the people of Egypt woke up during the night, and loud wailing was heard throughout the land of Egypt. There was not a single house where someone had not died.
Here the death of the children is directly at the hand of God.
Exodus, Chapter 32:
Then he [Moses] said to them, "This is what the Lord, the God of Israel, says: 'Each man strap a sword to his side. Go back and forth through the camp from one end to the other, each killing his brother and friend and neighbor.' "
The Levites did as Moses commanded, and that day about three thousand of the people died.
But, the most inane part of this is that most of the killing takes place AFTER the issuing of the ten commandments!
And when they were come into the house, they saw the young child with Mary his mother, and fell down, and worshipped him: and when they had opened their treasures, they presented unto him gifts; gold, and frankincense and myrrh. And being warned of God in a dream that they should not return to Herod, they departed into their own country another way. And when they were departed, behold, the angel of the Lord appeareth to Joseph in a dream, saying, Arise, and take the young child and his mother, and flee into Egypt, and be thou there until I bring thee word: for Herod will seek the young child to destroy him. When he arose, he took the young child and his mother by night, and departed into Egypt: And was there until the death of Herod: that it might be fulfilled which was spoken of the Lord by the prophet, saying, Out of Egypt have I called my son. Then Herod, when he saw that he was mocked of the wise men, was exceeding wroth, and sent forth, and slew all the children that were in Bethlehem, and in all the coasts thereof, from two years old and under, according to the time which he had diligently enquired of the wise men. Then was fulfilled that which was spoken by Jeremy the prophet, saying, In Rama was there a voice heard, lamentation, and weeping, and great mourning, Rachel weeping for her children, and would not be comforted, because they are not.
Granted "God" did not do this killing but he foresaw it and could have prevented it. After all, after saving his "son's" neck, he could have at least spared the little kids that died because of his son.
But... read on...god really gets into it directly himself in the following passages.
In Isaiah chapter 13, God paints this word picture:
Anyone who is captured will be run through with a sword. Their little children will be dashed to death right before their eyes. Their homes will be sacked and their wives raped by the attacking hordes. For I will stir up the Medes against Babylon, and no amount of silver or gold will buy them off. The attacking armies will shoot down the young people with arrows. They will have no mercy on helpless babies and will show no compassion for the children.
In Jeremiah chapter 49, verse 20, God paints a similar picture:
Therefore hear the plan which the LORD has made against Edom and the purposes which he has formed against the inhabitants of Teman: Even the little ones of the flock shall be dragged away; surely their fold shall be appalled at their fate. At the sound of their fall the earth shall tremble; the sound of their cry shall be heard at the Red Sea.
In Hosea chapter 13
Samaria shall bear her guilt, because she has rebelled against her God; they shall fall by the sword, their little ones shall be dashed in pieces, and their pregnant women ripped open.
Numbers chapter 31,
Moses said to them, "Have you let all the women live? Behold, these caused the people of Israel, by the counsel of Balaam, to act treacherously against the LORD in the matter of Pe'or, and so the plague came among the congregation of the LORD. Now therefore, kill every male among the little ones, and kill every woman who has known man by lying with him. But all the young girls who have not known man by lying with him, keep alive for yourselves.
This is just a wonderful, wonderful piece. Kill all the little boys; boys like my grandsons Samuel and Isaac, and keep all the virgins e.g. Molly and Annabel for yourselves so you can rape them.
In Deuteronomy we find this:
Next we turned and went up along the road toward Bashan, and Og king of Bashan with his whole army marched out to meet us in battle at Edrei. The LORD said to me, "Do not be afraid of him, for I have handed him over to you with his whole army and his land. Do to him what you did to Sihon king of the Amorites, who reigned in Heshbon." So the LORD our God also gave into our hands Og king of Bashan and all his army. We struck them down, leaving no survivors. At that time we took all his cities. There was not one of the sixty cities that we did not take from them-the whole region of Argob, Og's kingdom in Bashan. All these cities were fortified with high walls and with gates and bars, and there were also a great many unwalled villages. We completely destroyed them, as we had done with Sihon king of Heshbon, destroying every city-men, women and children. But all the livestock and the plunder from their cities we carried off for ourselves.
They massacred all the men, women and children in 60 cities at God's request.
7:1 When the LORD thy God shall bring thee into the land whither thou goest to possess it, and hath cast out many nations before thee, the Hittites, and the Girgashites, and the Amorites, and the Canaanites, and the Perizzites, and the Hivites, and the Jebusites, seven nations greater and mightier than thou;
7:2 And when the LORD thy God shall deliver them before thee; thou shalt smite them, and utterly destroy them; thou shalt make no covenant with them, nor shew mercy unto them:
Then there is Noah's flood, in which God massacred every single child on the face of the earth.