2 verses have
allegiance
in Edition Clear Qur'an by Talal Itani / Al-Fath (The Victory)

48:10Those who pledge allegiance to you are pledging allegiance to God. The hand of God is over their hands. Whoever breaks his pledge breaks it to his own loss. And whoever fulfills his covenant with God, He will grant him a great reward.

48:18God was pleased with the believers, when they pledged allegiance to you under the tree. He knew what was in their hearts, and sent down serenity upon them, and rewarded them with an imminent conquest.