Hadithcore
Bulugh al-Maram, 110

And Muslim added:

“Even if he does not ejaculate”.

زَادَ مُسْلِمٌ:

وَإِنْ لَمْ يُنْزِلْ

[1]‏ .‏

References2 variants
In-Book Reference
Book 1, Hadith 131
English Reference
Book 1, Hadith 117