Which preposition to use with arhats

at Occurrences 1%

Devotees of our Law from the various countries in that quarter go year by year to the mountain, and present offerings to Kasyapa; and to those whose hearts are strong in faith there come Arhats at night, and talk with them, discussing and explaining their doubts, and disappearing suddenly afterwards.

by Occurrences 1%

When it was being made over to an Arhat by pouring water on his hands, some drops fell on the ground.

Which preposition to use with  arhats