It is narrated from Sayyiduna Abdullah bin Amr (may Allah be pleased with them both): "No prayer should be prayed after Fajr, except two rak'ahs."
This narration is mawquf (stopping at the Companion), and it differs from the narration of al-Thawri and Ibn Wahb both in wording and in being mawquf; al-Thawri has better memory than the others, except that Abd al-Rahman al-Ifriqi is not used as evidence. It has a supporting mursal report from the hadith of Ibn al-Musayyib.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 4443