Tafsir of Muhammad 47:7

O you who believe! If you support (the cause of) Allah, He will support you and make your foothold firm. This is similar to His saying,

ولينصرن الله من ينصره

Indeed, Allah will surely support those who support Him (His cause). (22:40) That is because the reward is comparable to the type of deed that is performed. Thus, Allah says here,

ويثبت أقدامكم

(and make your foothold firm). Allah then says,