2 Samuel 13:28
“Now Absalom had commanded his servants, saying, Mark ye now when Amnon’s heart is merry with wine, and when I say unto you, Smite Amnon; then kill him, fear not: have not I commanded you? be courageous, and be valiant.”
Then said Absalom, If not, I pray thee, let my brother Amnon go with us. And the king said unto him, Why should he go with thee?
But Absalom pressed him, that he let Amnon and all the king’s sons go with him.
Now Absalom had commanded his servants, saying, Mark ye now when Amnon’s heart is merry with wine, and when I say unto you, Smite Amnon; then kill him, fear not: have not I commanded you? be courageous, and be valiant.
And the servants of Absalom did unto Amnon as Absalom had commanded. Then all the king’s sons arose, and every man gat him up upon his mule, and fled.
And it came to pass, while they were in the way, that tidings came to David, saying, Absalom hath slain all the king’s sons, and there is not one of them left.
Counter-Arguments
The strongest case that this verse does not belong in this theme.

Cross-References
“Have not I commanded thee? Be strong and of a good courage; be not afraid, neither be thou dismayed: for the Lord thy God is with thee whithersoever thou goest.”
“Thou shalt not avenge, nor bear any grudge against the children of thy people, but thou shalt love thy neighbour as thyself: I am the Lord.”
“But if he thrust him of hatred, or hurl at him by laying of wait, that he die;”
“Cursed be he that smiteth his neighbour secretly. And all the people shall say, Amen.”
“And Esau hated Jacob because of the blessing wherewith his father blessed him: and Esau said in his heart, The days of mourning for my father are at hand; then will I slay my brother Jacob.”