Sayyiduna Anas (may Allah be pleased with him) said: I heard the Messenger of Allah (peace and blessings be upon him) calling the talbiyah for Hajj and Umrah.
Sulayman (bin Harb) said: Abu Qilabah heard this hadith from Sayyiduna Anas (may Allah be pleased with him), and he is a jurist. Humayd and Yahya bin Abi Ishaq did not preserve it accurately; what is correct is what Abu Qilabah said: that the Prophet (peace and blessings be upon him) performed Hajj al-Ifrad, while some of the Companions of the Prophet (peace and blessings be upon him) combined Hajj and Umrah, and Sayyiduna Anas (may Allah be pleased with him) heard those who combined Hajj and Umrah.
The Shaykh said: A large group has narrated this hadith, such as Yahya bin Abi Ishaq, and Wuhayb from Ayyub. It was Sayyiduna Anas (may Allah be pleased with him) who became confused, so it is to be understood that he heard the Messenger of Allah (peace and blessings be upon him) teaching someone else how to call the talbiyah in Hajj al-Qiran.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 8833