This text appears in Hari-bhakti-vilasa [11.234]:

madhura-madhuram etan mangalaṁ mangalānāṁ
sakala-nigama-vallī-sat-phalaṁ cit-svarūpam
sakṛdapi parigītaṁ śraddhayā helayā vā
bhṛgu-vara nara-mātraṁ tārayet kṛṣṇa-nāma

”The holy name of Kṛṣṇa is the highest benediction, above any other benedictions; it is sweeter than the sweetest honey, the eternal fruit of transcendental knowledge of the tree of the entire scriptures. O best of the Bhargavas! If anyone chants Lord Kṛṣṇa’s name just once without offense, whether he chants with faith or indifferently, the holy name immediately liberates him.”