Brihat Parashara Hora Shastra
धर्मलग्नगते सौम्ये पञ्चमे सदसद्युते । पापे च चतुरस्रस्थे योगोऽयं मत्स्यसंज्ञकः ॥ २१॥
Matsya Yog. Benefics in Dharm and Tanu Bhava, mixed Grahas in Putr Bhava and malefics in Bandhu and Randhr Bhava: this array of Grahas at birth will produce Matsya Yog.
english translation
dharmalagnagate saumye paJcame sadasadyute । pApe ca caturasrasthe yogo'yaM matsyasaMjJakaH ॥ 21॥
hk transliteration by Sanscript