Al-Matalib al-'Aliyah 2931 — Explanation of the major sins

It is narrated from Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) that he was asked about the major sins, and he said: "Everything that Allah Almighty has forbidden in the Qur'an is a major sin", and he also mentioned the glance (a forbidden look, such as looking at a non-mahram woman).
Imam Abu Ya'la recorded it in his Musnad, and all its narrators are thiqat (trustworthy).