Importance of Hajj and Omrah

Abdollah ibn Fadhl says: “I said to Imam Sadeq (AS) that I have too many debts, I have a big family and I can't afford the Hajj costs. Teach me a prayer. Imam stated: Say after each obligatory prayer: “May the blessings of Allah be upon Mohammad (S) and his progeny, and pay my debts in this world and the hereafter."
I said to him, “I know what the worldly debts are but what are the debts of the hereafter?"
He said: “Hajj.” The prophet of God (S) looked at the strings of camels taking Hajji’s to the pilgrimage of God's House and said: They don't take steps unless it is taken as a good deed, they don't take steps unless it vanishes a sin of them. And when they finish their ceremony of Hajj, they will be told: “You have made a building, don't destroy it. Your sins are forgiven. From now on, do good deeds."