Yahya bin Abi Kathir يحيى بن أبي كثير الطائي · The Book on Fasting

the Messenger of Allah said: "Do no precede the month of Ramadan by fasting a day or two before it, unless it is the case of a man who normally performs some fast, then let him fast it."

"I could not find the Messenger of Allah one night. So I left and found him at Al-Baqi. He said: 'Did you fear that you had been wronged by Allah and His Messenger?' I said: 'O Messenger of Allah! I thought that you had gone to one of your wives.' So he said: 'Indeed Allah, Mighty and Sublime is He, descends to the lowest Heavens during the night of the middle of Sha'ban, to grant forgiveness to more than the…

The Prophet said: "The cupper and the one cupped have broke the fast."