Matsyapurana 145.43

145.43

paśūnāṃ dravyahaviṣām ṛksāmayajuṣāṃ tathā
ṛtvijāṃ dakṣiṇāyāśca saṃyogo yajña ucyate //

One who explains the dharma just as he knows and feels about it on being questioned is said to possess the fundamental attribute of truthfulness The Brahmachârya Japam silence and fast these very hard practices are called tapasya or penances. Yajña is the bringing together of wealth animals sacrificial offering Ṛik, Sāma and Yajuḥ Vedas and the sacrificial presents Dealing with others as if with one's own self always for the well being of all with gladness of heart is termed dayâ or kindness and is the best of all acts—42 45