Al-Kahf 18:95

Qala ma makkannee feehi rabbeekhayrun faaAAeenoonee biquwwatin ajAAal baynakum wabaynahum radma

He said, "That in which my Lord has established me is better [than what you offer], but assist me with strength [i.e., manpower]; I will make between you and them a dam.

He said, “What my Lord has (already) given in my control is better enough (for me than the tax you are offering to me), so help me (only) with some (man) power, and I shall make a rampart between you and them.