Musnad Ahmad 1304:51

Muhammad ibn Bakr narrated to us, Ubayd Allah ibn Abi Ziyad informed us, he said: Shahr ibn Hawshab narrated to us, from Asma bint Yazid, she said: I heard the Messenger of Allah, peace and blessings of Allah be upon him, saying: "In these two verses: {Allah, there is no deity except Him, the Ever-Living, the Sustainer of [all] existence} [Al-Baqarah: 255] and {Alif-Lam-Mim. Allah - there is no deity except Him, the Ever-Living, the Sustainer of [all] existence} [Al-Imran: 2], there is the Greatest Name of Allah."