Qur'an 4:112

وَمَن يَكْسِبْ خَطِيٓـَٔةً أَوْ إِثْمًا ثُمَّ يَرْمِ بِهِۦ بَرِيٓـًٔا فَقَدِ ٱحْتَمَلَ بُهْتَـٰنًا وَإِثْمًا مُّبِينًا

“But whoever earns an offense or a sin and then blames it on an innocent [person] has taken upon himself a slander and manifest sin.”

An-Nisaa 4:112 · Saheeh International