Apastambadharmasutra 2.2.5.4

2.2.5.4

[samāvṛttaṃ ced ācāryo- '[abhyāgacchet tam abhimukho- '[abhyāgamya tasya-[upasaṃgṛhya na [bībhatsamāna udakam [upaspṛśet [puraskṛtya-[upasthāpya yathopadeśaṃ [pūjayet /

If the (former) teacher visits him after he has returned home, he shall go out to meet him, embrace his (feet), and he shall not wash himself (after that act), showing disgust. He then shall let him pass first into the house, fetch (the materials necessary for a hospitable reception), and honour him according to the rule.