An-Nahl 16:105

Innama yaftaree alkathibaallatheena la yu/minoona bi-ayati Allahiwaola-ika humu alkathiboon

They only invent falsehood who do not believe in the verses of Allāh, and it is those who are the liars.

It is (not the Prophet but) the disbelievers in Allah’s verses who forge lies, and it is they who are the liars.