Skandapurana 6.3.51.8

6.3.51.8

kārttikī ca tathā māghī vaiśākhasya tṛtīyikā .
paurṇamāsī ca caitrasya jyeṣṭhasya ca viśeṣataḥ .. 51.8 ..

likewise the [full moons] of Kārttika and Māgha, and the third of Vaiśākha, / and especially the full moon of Caitra and of Jyeṣṭha;