What is the ruling on not going to congregational prayers—and praying at home instead—when one has a foot injury and a bandage on it, fearing that the injury might worsen by walking to the mosque?

Illness is an excuse for not attending congregational prayers, especially if walking to the mosque delays recovery. This is the view held by scholars, who cite the action of the Prophet, peace and blessings be upon him, when he was ill and commanded Abu Bakr to lead the people in prayer. The determination of this is to be referred to the statement of a trustworthy doctor or personal experience. A sick person who is accustomed to congregational prayers and ceases to attend them due to illness will have the reward of congregational prayer written for him.