Leviticus 2:2, 9, 16

and bring it to Aaron’s sons the priests. The priest will take a handful of fine flour and oil from it, along with all its frankincense, and will burn this memorial portion  of it on the altar, a food offering, a pleasing aroma to the LORD.

The priest will remove the memorial portion  from the grain offering and burn it on the altar, a food offering, a pleasing aroma to the LORD.

The priest will then burn some of its crushed kernels and oil with all its frankincense as a food offering to the LORD.