Surah Al-Mu'minun 23:7

فَمَنِ ٱبْتَغَىٰ وَرَآءَ ذَٰلِكَ فَأُو۟لَـٰٓئِكَ هُمُ ٱلْعَادُونَ

But whoever seeks beyond that, then those are the transgressors -

Translation: Saheeh International

Tafsir

But whoever seeks anything beyond that intercourse with wives and concubines such as masturbation those they are transgressors who have overstepped the bounds into what is not lawful for them.

Excerpt from Tafsir al-Jalalayn, commentary on 23:7, via Quran.com. The reader has the full commentary and 9 more tafsirs.