Srimad Bhagavatam

References to text SB 12.3.51
SB 12.3.51: My dear King, although Kali-yuga is an ocean of faults, there is still one good quality about this age: Simply by chanting the Hare Kṛṣṇa mahā-mantra, one can become free from material bondage and be promoted to the transcendental kingdom.

Text №
Lord Śrī Caitanya Mahāprabhu thought, “Unless people accept Me they will all be destroyed.” Thus the merciful Lord accepted the sannyāsa order.
The Author Receives the Orders of Krishna and Guru
CC 1.8.10
Simply chanting the Hare Kṛṣṇa mahā-mantra without offenses vanquishes all sinful activities. Thus pure devotional service, which is the cause of love of Godhead, becomes manifest.
The Author Receives the Orders of Krishna and Guru
CC 1.8.26
“ ‘According to Hindu scripture, God’s name is the most powerful hymn. If everyone hears the chanting of the name, the potency of the hymn will be lost.
The Pastimes of Lord Caitanya Mahaprabhu in His Youth
CC 1.17.212
“By this mantra, the people worship Lord Kṛṣṇa in Dvāpara-yuga. In Kali-yuga the occupational duty of the people is to chant congregationally the holy name of Kṛṣṇa.
Lord Sri Caitanya Mahaprabhu Instructs Sanatana Gosvami in the Science of the Absolute Truth
CC 2.20.339
“ ‘My dear King, although Kali-yuga is full of faults, there is still one good quality about this age. It is that simply by chanting the Hare Kṛṣṇa mahā-mantra, one can become free from material bondage and be promoted to the transcendental kingdom.’
Lord Sri Caitanya Mahaprabhu Instructs Sanatana Gosvami in the Science of the Absolute Truth
CC 2.20.344