Shiva Purana

siva.sh/siva-purana/saturda-samhita/19/28

भूत्वा रुद्रश्च दुर्वासा ब्रह्मतेजोविवर्द्धनः ।। चक्रे धर्मपरीक्षाञ्च बहूनां स दयापरः ।। २८ ।।

sanskrit

Siva by becoming Durvāsas, the enhancer of Brahminical splendour, tested the piety of many people. He was merciful.

english translation

bhUtvA rudrazca durvAsA brahmatejovivarddhanaH || cakre dharmaparIkSAJca bahUnAM sa dayAparaH || 28 ||

hk transliteration by Sanscript