Muhammad, Bai'ah (pledge) to him is Bai'ah (pledge) to Allah Muhammad

Indeed, those who pledge allegiance to you, [O Muḥammad] - they are actually pledging allegiance to Allāh. The hand¹ of Allāh is over their hands.² So he who breaks his word only breaks it to the detriment of himself. And he who fulfills that which he has promised Allāh - He will give him a great reward.

Certainly was Allāh pleased with the believers when they pledged allegiance to you, [O Muḥammad], under the tree, and He knew what was in their hearts, so He sent down tranquility upon them and rewarded them with an imminent conquest¹