Revākhaṇḍa ascribed to the Vāyupurāṇa (RKV) 56.51

56.51

vinā puṃsā tu yā nārī dvādaśābdaṃ śucivratā /
tiṣṭhate sākṣayaṃ kālaṃ rudraloke mahīyate //

And a woman who, without a man, remains for twelve years observing pure vows, / is honored in the world of Rudra for an imperishable time.”