Musnad Ahmad 1276:2

Muhammad ibn Ja'far narrated to us, Shu'bah narrated to us, from Muhammad ibn 'Abd al-Rahman, the freed slave of Talhah, who said: I heard Kurayb narrating from Ibn 'Abbas, from Juwayriyah, who said: The Messenger of Allah (peace and blessings of Allah be upon him) passed by Juwayriyah early in the morning while she was in the mosque, supplicating. Then he passed by her again near midday and said: "Are you still in the same state?" She said: "Yes." He (peace and blessings of Allah be upon him) said: "Shall I not teach you words that would equal them [in reward] if they were weighed against them? 'Glory be to Allah, the number of His creation' (three times), 'Glory be to Allah, to the extent of His own pleasure' (three times), 'Glory be to Allah, the weight of His Throne' (three times), 'Glory be to Allah, the ink of His words' (three times)." Her name was Barrah, so the Messenger of Allah (peace and blessings of Allah be upon him) named her Juwayriyah.