Musannaf Ibn Abi Shayba 3:2658

Al-Fadl ibn Dukayn narrated to us, from Isra'il, from Jabir, from 'Abd al-Rahman ibn al-Aswad, that: Al-Aswad and 'Alqamah used to perform ghusl (ritual bathing) on the day of Jumu'ah while traveling.