1)
Why did he say "Chamishah
1.
Rashi: If you do not have five, give to me what you have.
2.
Malbim: He requested five, for there are five youths far from an inhabited city.
3.
Malbim citing Parshas Derachim: The Kohen Gadol receives five of the 12 loaves of Lechem ha'Panim (Yuma 17b). David estimated that this would suffice for him, if Achimelech still has them. If Chulin is Nimtza (available), that is better!
