During the Battle of Badr, when the Messenger of Allah (ﷺ) wanted assurance from his companions that they would fight beside him, this companion said, “O Prophet of Allah, go ahead with what Allah has inspired you to do. We will stand by you. By Allah, we will never say as the Children of Israel said, `So go you and your Lord and fight you two, we are sitting right here.' Instead, we will say, `Go you and your Lord and we will fight with you.' By Allah, Who has sent you with the truth, if you take us to the end of the world, we will tolerate all hardships until we reach it with you. We will fight on your left, your right, in front of you and behind you until Allah bestows victory on you." Who was this companion?