Bulugh al-Maram

Bulugh al-Maram 110

Taking Ghusl (bath) And the precepts regarding Sexual Impurity
Arabic hadith text
زَادَ مُسْلِمٌ:"وَإِنْ لَمْ يُنْزِلْ "1‏ .‏‏1 ‏- وهي صحيحة أيضا.‏
Translation
And Muslim added

“Even if he does not ejaculate”.