Two lines
Expressions researched:
"two lines"
Sri Caitanya-caritamrta
CC Adi-lila
CC Adi 17.123, Purport: We are already accustomed to chant these two mantras—śrī-kṛṣṇa-caitanya prabhu-nityānanda śrī-advaita gadādhara śrīvāsādi-gaura-bhakta-vṛnda and Hare Kṛṣṇa, Hare Kṛṣṇa, Kṛṣṇa Kṛṣṇa, Hare Hare/ Hare Rāma, Hare Rāma, Rāma Rāma, Hare Hare. Now, after these, the other two lines—namely haraye namaḥ, kṛṣṇa yādavāya namaḥ/ gopāla govinda rāma śrī-madhusūdana—should be added, especially in Māyāpur. Chanting of these six lines should go on so perfectly well that no one there hears any vibration other than the chanting of the holy names of the Lord. That will make the center spiritually all-perfect.