In one narration the words are: I came to the Prophet (peace and blessings be upon him) in order to present my camel to him, and I saw that he (peace and blessings be upon him) had offered six rak'ahs at the time of Duha.
Al-Tabarani recorded both these narrations in al-Mu'jam al-Awsat through Muhammad bin Qays, as a hadith narrated from Sayyiduna Jabir (may Allah be pleased with him). Ibn Hibban mentioned this narrator (i.e. Muhammad bin Qays) in the book "al-Thiqat".