Garudapurana 3.29.65

3.29.65

sugānakāle saṃsmaredveṇugītaṃ hariṃ hariṃ pravadetsarvadaiva /
śrīmattulasyāśchedane caiva kāle śrīrāmarāmeti ca saṃsmarettu //

At the time of sweet singing, one should remember the song of the flute and always say, 'Hari, Hari'; / and at the time of cutting the sacred tulasī, one should remember, 'Śrī Rāma, Rāma.'