As for “all of them were arhats,” the term “arhat” means “one who is worthy.” The fifteen meanings of one who is worthy should be known. What are these fifteen?

1) One who is worthy receives food and bedding, honor, and reverence; 2) one who is worthy leads the great assembly in giving guidance to all [living beings]; 3) one who is worthy enters such places as cities and villages; 4) one who is worthy overcomes all heretical systems; 5) one who is worthy quickly surveys all phenomena (dharmas) with wisdom; 6) one who is worthy teaches the Dharma untiringly and in good physical condition in accordance with the truth (Dharma); 7) one who is worthy sits tranquilly in a secluded forest, does not accumulate or gather food, clothing, or possessions, and is satisfied with little; 8) one who is worthy intently practices good conduct and does not become attached to any meditation; 9) one who is worthy carries out the noble practice of emptiness; 10) one who is worthy carries out the noble practice of signlessness; 11) one who is worthy carries out the noble practice of wishlessness; 12) one who is worthy suppresses [their desire for] the tranquility of worldly meditation; 13) one who is worthy has produced the superior qualities of all the supernatural powers; 14) one who is worthy has realized the superior merits of the supreme meaning; and 15) with their knowledge of true reality, one who is worthy [knows] the merits that those of the same group have attained in order to benefit all living beings.