A KAFIR’s DEED will be brought to the SCALE but they will have NO WEIGHT and ultimately he will be thrown in the HELL

Ibn Abbas RadiAllahu Anhu said:

Good and bad deeds will be weighed in the Scale that has a tongue and two pans.

A believer will be brought forward in a good state with his deeds, and when his deeds are put in one of the pans, it becomes heavier than the other.
This is mentioned in the verse: {…So as for those whose scale (of good deeds) will be heavy, they will be successful (by entering Paradise).} [7:8].
The deeds of an unbeliever will be brought in a bad repulsive state, and when they will be put in the pan of the scale; they will have no weight, and ultimately he will be thrown in the Fire (Hell). [ al-Qurtubi ]