CC Madhya 24.119

guṇākṛṣṭa hañā kare kṛṣṇera bhajana
ekādaśa-skandhe tāṅra bhakti-vivaraṇa
Word for word: 
guṇa-ākṛṣṭa hañā — being attracted by the transcendental qualities; kare — engaged in; kṛṣṇera bhajana — the devotional service of the Lord; ekādaśa-skandhe — in the Eleventh Canto of Śrīmad-Bhāgavatam; tāṅra — of them; bhakti-vivaraṇa — description of the devotional service.
Translation: 
“In the Eleventh Canto of Śrīmad-Bhāgavatam there is a full description of the devotional service of the nine Yogendras, who rendered devotional service because they were attracted by the Lord’s transcendental qualities.