Holier Than Thou - Biblical Contradictions

Does God violate his own commandments?

Exodus 20:13, "Thou shalt not kill." (KJV)

Exodus 32:27, "And he said unto them, Thus saith the LORD God of Israel, Put every man his sword by his side, and go in and out from gate to gate throughout the camp, and slay every man his brother, and every man his companion, and every man his neighbour." (KJV)

According to Exodus 20:13, one of the ten commandments is not to kill, however, according to Exodus 32:27, God orders the Israelites to kill their enemies.

"Sorrow is better than laughter: for by the sadness of the countenance the heart is made better. The heart of the wise is in the house of mourning; but the heart of fools is in the house of mirth." (Ecclesiastes 7:3-4, KJV)

"Then I commended mirth, because a man hath no better thing under the sun, than to eat, and to drink, and to be merry: for that shall abide with him of his labour the days of his life, which God giveth him under the sun." (Ecclesiastes 8:15, KJV)