In the Padma Purāṇa, there is a nice statement praising the service of the Vaiṣṇavas, or devotees. In that scripture Lord Śiva tells Pārvatī, "My dear Pārvatī, there are different methods of worship, and out of all such methods the worship of the Supreme Person is considered to be the highest. But even higher than the worship of the Lord is the worship of the Lord's devotees."
A similar statement is in the Third Canto, Seventh Chapter, verse 19, of Śrīmad-Bhāgavatam: "Let me become a sincere servant of the devotees, because by serving them one can achieve unalloyed devotional service unto the lotus feet of the Lord. The service of devotees diminishes all miserable material conditions and develops within one a deep devotional love for the Supreme Personality of Godhead."
Nectar of Devotion 12