'Uqba ibn 'Amir al-Juhani passed by a man who looked like a Muslim
who greeted him. 'Uqba answered him, saying, "And on you and the mercy
of Allah and his blessings." His slave said to him, "He is a Christian."
'Uqba got up and followed him until he caught up to him. He said, "The
mercy of Allah and His blessings are for the believers, but may Allah make
your life long and give you much wealth and many children."