Shiva Purana

siva.sh/siva-purana/saturda-samhita/5/21

सिद्धक्षेत्रे महापुण्ये शिखण्डी नाम पर्वतः ।। शिखण्डिनो वनं वापि यत्र सिद्धनिषेवितम् ।। २१ ।।

sanskrit

In the very sacred holy centre of achievements there is the mountain Śikhaṇḍin, where the forest is resorted to by the Siddhas.

english translation

siddhakSetre mahApuNye zikhaNDI nAma parvataH || zikhaNDino vanaM vApi yatra siddhaniSevitam || 21 ||

hk transliteration by Sanscript