Shiva Purana
सर्पस्या"स्यगतम्पश्यन्यस्तु रक्ष्यमुपेक्षते ॥ दोषाभासान्समुत्प्रेक्ष्य फलतः सो ऽपि निर्घृणः ॥ ४१ ॥
He who neglects the man worthy of being protected on considering the apparent defaults though he observes his plight is in effect ruthless.
english translation
sarpasyA"syagatampazyanyastu rakSyamupekSate ॥ doSAbhAsAnsamutprekSya phalataH so 'pi nirghRNaH ॥ 41 ॥
hk transliteration by Sanscript