It's mentioned in Shiva Purana: Śatarudra-saṃhitā: Chapter 20 - The Incarnation of Hanūmat and his story:
Indeed he [Hanuman] was the Incarnation of Śiva the lord and uplifter of devotees. He was the life-saviour of Lakṣmaṇa and the destroyer of the arrogance of all Daityas.
Hanuman Chalisa also mentions Hanumanji as son of Anjani, Keshari and son/...
An extract from this book says that Rishi Savya was an incarnation of Indra.
Savya is the rishi in Rig Veda and Sama Veda. His Richas and mantras
are collected in Rig Veda 1:51 - 57 and in Sama Veda 373,376 and 377.
He belongs to Angirasa Gotra.
Acharya Sayana has explained that Savya was an incarnation of God of
Gods Indra. So he is called ...
Kalki; the last incernation of Lord Vishnu will come when kaliyug will running at it's end the situations will be completely changed. People will stop to follow Vedas and everyone will engage in crime
Srimand bhagwatam 12:2:12-16
When the bodies of all living entities are in decay from the contamination of Kali-yuga, when the dutifulness of the members ...
Does any reference of Ma Sarswati being reincarnated as another Devi?
As per Shiva Purāna: Umā-Saṃhitā: Chapter 48 - The manifestation of Sarasvatī, the goddess who was slayer of Śumbha was an incarnation of Sarasvatī:
Thus was the goddess, slayer of Śumbha born. She is said to be Sarasvatī. O king, she has manifested herself as a part of Umā.