Matthew Poole and continuators on Leviticus 14:4

4 Then shall the priest command to take for him that is to be cleansed, two birds alive, and clean , and Cedar-wood , and scarlet , and hyssop ,

The one to represent Christ as dying for his sins, the other to represent him as rising again for his purification or justification.

Allowed for food and for sacrifice.

A stick of Cedar to which the hyssop and one of the Birds was tied by the scarlet thred. Cedar seems to be chosen to note that the leper was now freed from that putrefaction or corruption, which his leprosie had brought upon him, that kind of wood being in a manner incorruptible.

A thred of wool of a scarlet colour, Heb. 9. 19. to represent both the lepers sinfulness, Isa. 1. 18. and the blood of Christ, and the happy change of the lepers colour and complexion, which before was wan and loathsome, now sprightly and beautiful.

Chosen partly for its fragrant smell, which signified the cure of the lepers ill sent, and partly for conveniency in the use of sprinkling. See Exod. 12. 22.

Marginal references: Or, sparrows.; Numb. 19. 6. Psal. 51. 7.