Exodus 30:34-35

34Then the Lord said to Moses, ‘Use the same amount of each of these sweet spices to make some incense: gum resin, onycha, galbanum and frankincense.

35Give them to a worker who can use special skills to make the incense. It must have a sweet smell, like a perfume. Add some salt to it so that it is a pure and holy incense.