A man who enters ihram for Hajj and wants to add Umrah to it

Sayyiduna Ibn Umar (may Allah be pleased with them both) entered ihram for Umrah, then travelled for a while and said: "Hajj and Umrah are both the same; bear witness that I have made Hajj binding upon myself along with the Umrah."

A man asked Sayyiduna Jabir (may Allah be pleased with him): I have entered ihram for Hajj (alone); may I join Umrah with it? He said: "Yes, and slaughter a ram."

Ibrahim said: Hajj may be added to Umrah, but Umrah may not be added to Hajj.

Mujahid, Tawus and Ata said: If a man enters ihram for Hajj, then if he wishes he may join Umrah with it and become a qarin (one performing both together), and send a sacrificial animal.

And from Ata and Tawus, or one of them, regarding a man who entered ihram for Hajj, they said: If he wishes, he may join Umrah with it and so be a qarin (one performing both together), and offer a sacrificial animal.