leviticus 22:19 Ye shall offer at your own will a male without blemish, of the beeves, of the sheep, or of the goats. - Free Bible Online

      19. Ye shall offer at your own will--rather, to your being accepted.
      a male without blemish--This law (Le 1:3) is founded on a sense of natural propriety, which required the greatest care to be taken in the selection of animals for sacrifice. The reason for this extreme caution is found in the fact that sacrifices are either an expression of praise to God for His goodness, or else they are the designed means of conciliating or retaining His favor. No victim that was not perfect in its kind could be deemed a fitting instrument for such purposes if we assume that the significance of sacrifices is derived entirely from their relation to Jehovah. Sacrifices may be likened to gifts made to a king by his subjects, and hence the reasonableness of God's strong remonstrance with the worldly-minded Jews (Mal 1:8). If the tabernacle, and subsequently the temple, were considered the palace of the great King, then the sacrifices would answer to presents as offered to a monarch on various occasions by his subjects; and in this light they would be the appropriate expressions of their feelings towards their sovereign. When a subject wished to do honor to his sovereign, to acknowledge allegiance, to appease his anger, to supplicate forgiveness, or to intercede for another, he brought a present; and all the ideas involved in sacrifices correspond to these sentiments--those of gratitude, of worship, of prayer, of confession and atonement [BIB. SAC.].

JFB.