Shiva Purana
तदैवं कुर्वतस्तस्य बिल्वपत्राणि कानिचित् ॥ तत्प्रारब्धवशाद्विष्णो पतितानि शिवोपरि ॥ ५२ ॥
O dear, while he attempted to do this, a few Bilva leaves fell on Śiva as a result of his Prārabdha.
english translation
tadaivaM kurvatastasya bilvapatrANi kAnicit ॥ tatprArabdhavazAdviSNo patitAni zivopari ॥ 52 ॥
hk transliteration by Sanscript