Exodus 30:20

30:20 When they enter the tent of meeting, they must wash with water so that they do not die. Also, when they approach the altar to minister by burning incense as an offering made by fire to the Lord,

Exodus 30:37

30:37 And the incense that you are to make, you must not make for yourselves using the same recipe; it is to be most holy to you, belonging to the Lord.

Exodus 37:25

The Making of the Altar of Incense

37:25 He made the incense altar of acacia wood. Its length was a foot and a half and its width a foot and a half – a square – and its height was three feet. Its horns were of one piece with it.