Chandogya UpanishadChandogya Upanishad 3.17.4
तपो दानम् आर्जवम् अहिंसा सत्यवचनम्
Tapo dānam ārjavam ahiṃsā satya-vacanam
Austerity, charity, uprightness, non-violence and truthfulness — these are the true offerings.
— Ekam (simplified)
📖 Story
In Eminabad, Nanak chose the coarse bread of Bhai Lalo, an honest carpenter, over the lavish feast of Malik Bhago, a wealthy official. Pressed to explain, he squeezed Lalo's bread and milk flowed; he squeezed Bhago's and it dripped blood — the sweat of the poor. True religion, he showed, is honest compassion, never show.