Fiqh-us-Sunnah Volume 4, Funerals and Dhikr, Fiqh 4.142A.
Section : Offering Two Raka’at Before the Journey.
Al-Mut’am ibn al-Miqdam reported that the Prophet, peace be upon him, said, “No one leaves anything behind with his family better than the two raka’at of prayers that he offers with them while intending to go on a journey.” (At-Tabarani and Ibn ‘Asakir as a mursal hadith)