Listen to the recitation by Sukadev Bretz from Yoga Vidya Germany: Hatha Yoga Pradipika chapter two, 65th verse:
विधिवत् कुम्भकं कृत्वा रेचयेद् इडयानिलम् ।
वातपित्तश्लेष्महरं शरीराग्निविवर्धनम् ॥६५॥
Simplified transcription:
vidhi vat kumbhakam kritva rechayed idayanilam |
vata pitta shleshma haram shariragni vivardhanam ||65||
More information about this verse can be found at the Hatha Yoga Pradipika portal. Just go to HYP II 65:
Hatha Yoga Pradipika in sanskrit plus a translation into GermanGerman translation additional with comments by Swami Brahmananda, Swami Vishnu-devananda and Sukadev in GermanHatha Yoga Pradipika Sanskrit text in devanagari.