natvā tad-aṅghrīn prakṣālya
pūjayāṁ cakra īśvarān
Śrīla Prabhupāda comments: “Bahulāśva, the King of Videha, was very intelligent and was a perfect gentleman. He was astonished that so many great sages, along with the Supreme Personality of Godhead, were personally present in his home. He knew perfectly well that conditioned souls engaged in worldly affairs cannot be one-hundred-percent pure whereas the Supreme Personality of Godhead and His pure devotees are always transcendental to worldly contamination. Therefore, when he found that the Supreme Personality of Godhead, Krsna, and all the great sages were at his home, he was astonished, and he began to thank Lord Krsna for His causeless mercy.”
The word īśvara in this verse refers not only to the Supreme Lord but also to the exalted sages in His company; this is confirmed by Ācāryas Śrīdhara Svāmī and Viśvanātha Cakravartī.