Shiva Purana
दृष्ट्वा रुद्रं प्रव्रजंतं हतविष्णुसुतं वृषम्॥ शरैस्सन्ताडयामास दिव्यैरस्त्रैश्च केशवः॥ ८॥
On seeing Śiva in the form of the bull going along after killing his sons, Viṣṇu hit him with divine arrows and missiles.
english translation
dRSTvA rudraM pravrajaMtaM hataviSNusutaM vRSam॥ zaraissantADayAmAsa divyairastraizca kezavaH॥ 8॥
hk transliteration by Sanscript