It is narrated from Sayyiduna Abdullah bin Umar (may Allah be pleased with them) that Sayyiduna Umar bin Khattab (may Allah be pleased with him) said: No pilgrim should return from Makkah until he performs the Tawaf of the Ka'bah, because the last act of worship is to perform the Tawaf of the Ka'bah.

Imam Malik, may Allah have mercy on him, said that when Sayyiduna Umar, may Allah be pleased with him, said that the last act of worship is the Tawaf of the Ka'bah, what is meant by this is that Allah, Glorious and Exalted is He, says: "Whoever honors the symbols of Allah, then it is from the piety of the hearts." Then He says: "Their return is to the Ka'bah." So the culmination of all the rites and acts of worship of Hajj is at the Ka'bah.