Al-Matalib al-'Aliyah 610 — The regular sunnah prayers and keeping

It is narrated from Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) that he said to Abu Yahya: "O Abu Yahya! Did you see that last night I slept (heedlessly) through the witr prayer! Ibn Makhramah and another man with him came to me, and the two of them kept me so occupied (in conversation) that I could not pray the witr. Then I slept until morning came and the slave-girl woke me. I said to her: 'Look, has the sun risen?' She replied: 'No.' So I prayed the two (sunnah) rak'ahs of Fajr. Then I asked: 'Look, has the sun come out now?' She said: 'No.' So I performed the (obligatory) Fajr prayer."
Imam Musaddad bin Musarhad narrated it in his Musnad. The narrator Abu Harun al-Ghanawi in its chain has been criticised in terms of jarh and ta'dil (narrator criticism), but on the basis of other supporting reports the meaning is correct.