Sayyiduna Ibn Abbas (may Allah be pleased with them both) narrates that the Messenger of Allah (peace and blessings be upon him) used to pray thirteen rak‘ahs (units) of (the night prayer) Tahajjud at night.
Some of those who have not deeply mastered knowledge think that it contradicts some of the reports of Aisha regarding the number of the Prophet’s (peace and blessings be upon him) prayers at night.
Hadith Referenceصحيح ابن خزيمه / جماع أبواب صلاة التطوع بالليل / 1164