• vidhi-vat — according to scriptural injunction
  Vidhi-vat — by the rule. Bhagavān worships Nārada exactly as the śāstra prescribes for honouring a guest-sage. The Lord does not improvise around the Veda; He honours it from inside.
• su-nṛtaiḥ vākyaiḥ — with truthful and pleasing words
  Su-nṛta is a Vedic compound (Manu 2.51 and SB elsewhere) for words that are simultaneously sweet and true. The Gauḍīya practical teaching: speech that is true but harsh, or sweet but false, is not su-nṛta. Bhagavān's own speech is the standard.
• śraddhayā — with faith, reverence
  Śraddhā — the Bhāgavata's foundational term for the inner condition of bhakti (cf. ādau śraddhā, Rūpa Gosvāmī). Kṛṣṇa Himself approaches His devotee with śraddhā — the model is set.
• tarpayan — satisfying, gratifying
  Tarp — to satisfy, related to tarpaṇa, the daily offering to forefathers and devas. Bhagavān performs tarpaṇa toward His devotee Nārada — a sacred reversal.

• UM SB 10-70-34-37 - Sweet Human Like Pastimes - 2019-01-06 Chennai
  Her Grace Urmila Mataji· 2019-01-06· English

Kṛṣṇa offering Nārada a seat and speaking 'truthful and pleasing words' (su-nṛtaiḥ vākyaiḥ) is like the ocean offering a cup of its own water to a river. The seat, the worship, the words — all His; yet given as if received.