Same indexed hadith alkafi-10267; it ends on this printed page after beginning on pages 540-541.
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كُلُّ مَا أَنْزَلَ بِهِ الرَّجُلُ مَاءَهُ فِي هَذَا وَ شِبْهِهِ فَهُوَ زِنًى.
English translationMuhammad Sarwar
3. Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad from Ahmad ibn al-Hassan from ‘Amr ibn Sa‘id Musaddiq ibn Sadaqah from ‘Ammar ibn Musa who has said the following: “About the case of a man who engages in sexual intercourse with animals or causes his semen to discharge, abu ‘Abd Allah (a.s.), has said, ‘Whenever a man causes his semen to discharge in this or that way it is fornication.’”
Translation: Muhammad Sarwar·Thaqalayn link·The Arabic above is the original.
Hadith gradings
1- موثقAllamah Baqir al-MajlisiMirʾāt al-ʿUqūl fī Sharḥ Akhbār Āl al-Rasūl (0/385)