After placing the body into the recess of the grave, when throwing the First handful of sand/soil on the grave recite:
During the Second handful recite:
During the Third handful recite:
وَمِنۡهَا نُخۡرِجُكُمۡ تَارَةً اُخۡرٰى
It is MAKROOH to add more sand/soil to the grave/kabr than that which was dug out from it.