Commands and prohibitions can also take emphatic endings: the basic command or prohibition remains, but its force increases.
Word / formMeaning / explanation
بِعْ → بِيعَنَّcertainly sell!
لَا تَبِعْ → لَا تَبِيعَنَّdo not sell under any circumstances!
لَا تَبِيعَنْprohibition with light emphatic nūn.
لِيَبِيعَنَّlet him certainly sell.
Heavy nūn is doubled; light nūn is vowelless. Unused light-nūn positions are not completed by analogy.