Shiva Purana
कोटिरुद्र सहस्राद्यं कोटिरुद्रं तथैव च । वायवीयं धर्मसंज्ञं पुराणमिति भेदतः 1-2-५० ।
One crore (ten million) Rudras, thousands of Rudras, and likewise, the Vayaviya (air-related) Rudra, known by the name Dharma, are described in the Purāṇas in different ways.
english translation
koTirudra sahasrAdyaM koTirudraM tathaiva ca । vAyavIyaM dharmasaMjJaM purANamiti bhedataH 1-2-50 ।
hk transliteration by Sanscript