Ashy prinia or ashy wren-warbler (Prinia socialis)
These are small warblers that are ash grey above with white-tipped graduated tails. They have a rufous colouring on the breast and flanks and are found in India and Srilanka.
This particular image was taken in the fields along Niphad Lake outside the Nandur Madhmeshwar Bird Sanctuary in Nashik, Maharastra, India.
Niphad Lake, Nashik, India. 27th December 2020