Musannaf Ibn Abi Shayba 3:5785

Waki' narrated to us, he said: Al-A'mash narrated to us, from Ibrahim, who said: A man came to the Prophet, may Allah bless him and grant him peace, and said: "O Messenger of Allah, I am a merchant man who travels to Bahrain." So he commanded him to pray two rak'ahs.