Mukhtasar Bukhari (Abridged) 706 — Not giving Zakat is a major sin

Sayyiduna Abu Hurairah (may Allah be pleased with him) narrates that the Noble Prophet (peace and blessings be upon him) said: "On the Day of Resurrection, camels for which zakat was not paid will come in a healthy and fat state and will trample their owner under their feet. And goats for which zakat was not paid will come in a healthy and fat state, riding upon their owner, trampling him under their feet and striking him with their horns." He (peace be upon him) said: "One of its rights is that it should be taken to the watering place (and its milk given to the needy who are present there)." And he said: "None of you should come to me on the Day of Resurrection carrying a goat on his neck, the goat bleating, and then say to me, 'O Muhammad! (intercede for me),' and I will say, 'I have no authority for you in any matter. I have conveyed (the command of Allah).' Nor should anyone come to me carrying a camel on his neck, the camel grunting, and then say to me, 'O Muhammad! (intercede for me),' and I will say, 'I have no authority for you in any matter. I have conveyed the command of Allah.'"