Ramayana 2.97.4

यद्द्रव्यं बान्धवानां वा मित्राणां वा क्षये भवेत्।नाहं तत्प्रतिगृह्णीयां भक्षान्विषकृतानिव।।।।

yad dravyaṃ bāndhavānāṃ vā mitrāṇāṃ vā kṣaye bhavet | na ahaṃ tat pratigṛhṇīyāṃ bhakṣān viṣakṛtān iva ||

I would never accept wealth that comes through the ruin of kinsmen or friends—like food that has been laced with poison.