Jabir bin Abdullah (may Allah be pleased with him) was asked: Is Umrah obligatory, a duty like the duty of Hajj? He said: No, but if you perform Umrah, it is better for you.
This is what is preserved from Jabir, as mawquf (his own saying), not marfu'. It has also been narrated from Jabir as marfu' with the opposite (meaning), and both are da'if (weak).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 8753