Skandapurana 16.165.147

16.165.147

yasmādbhavatāṃ sāvitryā śāpo datto sade tviha..
atra dattaṃ hutaṃ cāpi sarvamakṣayakārakam..
datto varo mayā tena yuṣmākaṃ dvijasattamāḥ .. 147 ..

Because a curse was pronounced upon you here in the assembly by Sāvitrī,
whatever is given and offered into fire here shall become imperishable;
therefore has this boon been granted to you by me, O best of the twice-born.