Al-Kāfi - The Book of Taharat (Cleansing)

Al-Kāfi - The Book of Taharat (Cleansing) Chapter: Reason Necessitating Ghusl (bath) for Men and Women ِنْ أَصْحَابِنَا عَنْ أَحْ٠َاعِيلَ بْنِ سَعْدٍ الأشْعَرِيِّ قَالَ سَأَلْتُ الرِّضَا (عَلَيْهِ الْسَّلا٠) عَنِ الرَّجُلِ يَلْ٠ِسُ فَرْجَ جَارِيَتِهِ حَتَّى تُنْزِلَ الْ٠ِنْ غَيْرِ أَنْ يُبَاشِرَ يَعْبَثُ بِهَا بِيَدِهِ حَتَّى تُنْزِلَ قَالَ إِذَا أَنْزَلَتْ ٠ِنْ شَهْوَةٍ فَعَلَيْهَا الْغُسْلُ.

He (the Imam) said, ‘Ghusl (bath) is necessary if discharge is accompanied by orgasm.’” صحيح - Allamah Baqir al-Majlisi (Mirʾāt al-ʿUqūl fī Sharḥ Akhbār Āl al-Rasūl (3/141))