en_tn_lite_do_not_use/lev/16/14.md

the blood of the bull

This is the blood Aaron caught with a bowl in Leviticus 16:11.

sprinkle it with his finger

He used his finger to splash the blood.

on the front of the atonement lid

He put the blood on the top part of the lid. He also put it on the side of the lid that was towards him as he entered the most holy place.

before the atonement lid

Possible meanings are 1) "below the atonement lid onto the chest" or 2) "onto the ground in front of the atonement lid."