Garudapurana 1.59.30

1.59.30

paurṇamāsyapyamāvāsyā śreṣṭhā syācca bṛhaspatau /
dvādaśīṃ dahate bhānuḥ śaśī caikādaśīṃ dahet //

and the full-moon day and the new-moon day are best on Thursday. / The Sun burns the twelfth lunar day, and the Moon burns the eleventh;