is neglecting to pray salat a worse sin than zina?
Some scholars, such as Ibn al-Qayyim, have said that. But there is no explicit evidence on this from the Quran or hadith. The reason they say that is because intentionally avoiding the prayer is out of arrogance and rebelliousness, while committing adultery is out of desire, and rebelliousness is considered a greater sin due to it being more intentional and cold-blooded.
But personally I recommend not speculating about which sin is greater. It is God’s business, and the judgment may differ with each specific case.
Selam aleykum! About the question if neglecting prayer is worse than zina - Praying is one of the five pillars of Islam, so shouldn't it be seen as a worse sin than adultery?
Alaikumassalam wa rahmatullah,
It is not a simple comparison because adultery has more serious and long-lasting consequences, while a person may neglect the prayer due to suffering depression. Since human thought and motivation are so complex, we should leave it to God to judge each case according to all the relevant factors.