David said on that day, "Whoever attacks the Jebusites must approach the 'lame' and the 'blind' who are David's enemies by going through the water tunnel." For this reason it is said, "The blind and the lame cannot enter the palace."
Caleb said, "To the man who attacks and captures Kiriath Sepher I will give my daughter Acsah as a wife."
The men of Israel said, "Have you seen this man who is coming up? He does so to defy Israel. But the king will make the man who can strike him down very wealthy! He will give him his daughter in marriage, and he will make his father's house exempt from tax obligations in Israel."
David said, "Whoever attacks the Jebusites first will become commanding general!" So Joab son of Zeruiah attacked first and became commander.