Sunan Abi Dawud Book 5, Hadith 101
The Messenger of Allah (ﷺ) used to pray thirteen rak'ahs during the night, observing the witr prayer with nine (or as she said). He used to pray two rak'ahs while sitting and pray two rak'ahs of the dawn prayer between the adhan and the iqamah.
This tradition has also been transmitted by 'Aishah through a different chain of narrators. But the tradition narrated by Hammad b. Salamah is not equal to the tradition narrated by others.
The Messenger of Allah (ﷺ) used to observe the witr prayer with nine rak'ahs. Then he used to pray seven rak'ahs (of witr prayer). He would pray two rak'ahs sitting after the witr in which he would recite the Qur'an (sitting). When he wished to bow, he stood up and bowed and prostrated.
Abu Dawud said: These two traditions have been transmitted by Khalid b. 'Abd Allah al-Wasiti. In his version he said: 'Alqamah b. Waqqas said: O mother, how did he pray the two rak'ahs ? He narrated the rest of the tradition to the same effect.