Sayyiduna Jabir bin Abdullah (may Allah be pleased with him) narrates: The Prophet (peace and blessings be upon him) used to perform one rak'ah of witr.
Imam al-Bazzar recorded this narration; its chain contains a narrator, Shurahbil bin Sa'd, whom Ibn Hibban declared thiqah (trustworthy), while a group declared him da'if (weak).