a major sin

Abdullāh ibn ‘Abbās (may Allah be pleased with him) reported: The Prophet (may Allah's peace and blessings be upon him) passed by two graves and said: "They are being tormented, but they are not tormented for a major sin. One of them would not avoid urine, and the other used to walk about spreading malicious gossip. [Sahih/Authentic] - [Al-Bukhari and Muslim]