Deuteronomy 25:17-18:

Remember what Amalek did unto thee by the way, when ye were come forth out of Egypt;
How he met thee by the way, and smote the hindmost of thee, even all that were feeble behind thee, when thou wast faint and weary; and he feared not God.

See also:

Objection: Some Who Get Healed at Healing Crusades Don’t Keep Their Healings
Objection: There WERE Feeble People Among Israel’s Tribes (Deuteronomy 25:17-28), So We Cannot Use Psalm 105:37 to Claim That None Should Be Feeble Today
Psalm 105:37