Al-Baghawi also recorded it through this route in Sharh al-Sunnah (14/339/4149). Ibn Lahi'ah appears to have been corroborated, for al-Haythami said (10/201–202): “Ahmad and al-Tabarani narrated it, and the narrators in one of al-Tabarani’s two chains are the narrators of the Sahih.” Al-Mundhiri preceded him in this, saying (4/79): “Ahmad and al-Tabarani narrated it through two chains; the narrators of one of them are the narrators of the Sahih.”

I then found it in al-Tabarani’s al-Mu'jam al-Kabir (17/284/783), through the route of Sa'id ibn 'Ufair: Ibn Lahi'ah narrated it to us with this chain. He then narrated it (no. 784) through the route of Yahya ibn Ayyub, from Yazid ibn Abi Habib, with the same chain. I say: This is a strong corroborating transmission from Yahya ibn Ayyub al-Ghafiqi, who was trustworthy and among the narrators of al-Bukhari and Muslim.

2855 — “If you do that, your eyes will become sunken and your strength will be exhausted”—that is, perpetual fasting and night prayer.

Abu 'Ubayd mentioned it in al-Gharib (4–5), without a chain, from the Prophet, peace and blessings be upon him: that he said this to 'Abd Allah ibn 'Amr ibn al-'As, after mentioning night prayer and daytime fasting. I say: It is part of an authentic hadith, narrated by Abu al-'Abbas al-Makki, who heard 'Abd Allah ibn 'Amr, may Allah be pleased with them both, say: The Messenger of Allah, peace and blessings be upon him, said to me: “O 'Abd Allah ibn 'Amr, you fast perpetually and stand in prayer at night; and if you do that—”