Sayyiduna Abdullah bin Abbas (may Allah be pleased with him) says: When the Messenger of Allah (peace and blessings be upon him) fell ill, he (peace and blessings be upon him) instructed Sayyiduna Abu Bakr (may Allah be pleased with him) to lead the people in prayer. Then one day, the Prophet (peace and blessings be upon him) felt some relief, so he came (to the mosque). When Sayyiduna Abu Bakr (may Allah be pleased with him) sensed the arrival of the Prophet (peace and blessings be upon him), he intended to step back, but the Noble Prophet (peace and blessings be upon him) gestured to him (to remain in his place). Then the Prophet came and sat to the left of Sayyiduna Abu Bakr (may Allah be pleased with him) and began reciting from the verse where Sayyiduna Abu Bakr (may Allah be pleased with him) had reached.