Śrīmad-Bhāgavatam · Text 11.3.29
Who is speaking and story frame
एवं कृष्णात्मनाथेषु मनुष्येषु च सौहृदम् ।
परिचर्यां चोभयत्र महत्सु नृषु साधुषु ॥ २९ ॥
evaṁ kṛṣṇātma-nātheṣu
manuṣyeṣu ca sauhṛdam
paricaryāṁ cobhayatra
mahatsu nṛṣu sādhuṣu
One who desires his ultimate self-interest should cultivate friendship with those persons who have accepted Kṛṣṇa as the Lord of their life. One should further develop an attitude of service toward all living beings. One should especially try to help those in the human form of life and, among them, especially those who accept the principles of religious behavior. Among religious persons, one should especially render service to the pure devotees of the Supreme Personality of Godhead.
Read the purport on Vedabase.ioFrom Canto 10, chapter 14 onward, the translation and purports were completed by Śrīla Prabhupāda's disciples after his departure, and published by the Bhaktivedanta Book Trust.