لَا يَدْخُلُ الْجَنَّةَ قَتَّاتٌ
A warning about maliciously spreading private talk.
لَا يَدْخُلُ الْجَنَّةَ قَاطِعٌ
A warning about severing kinship ties.
Both have the same structure: negative لَا, verb يَدْخُلُ, object الْجَنَّةَ, and a final word identifying the subject. Changing that final word changes the condemned behavior.
Grammar therefore helps locate who is being described, rather than merely supplying labels to memorize.