2 And the class of oblations in general has not been set aside; for there were both oblations there [among the Jews], and there are oblations here [among the Christians]. Sacrifices there were among the people; sacrifices there are, too, in the Church: but the species alone has been changed, inasmuch as the offering is now made, not by slaves, but by freemen. For the Lord is [ever] one and the same; but the character of a servile oblation is peculiar [to itself], as is also that of freemen, in order that, by the very oblations, the indication of liberty may be set forth. For with Him there is nothing purposeless, nor without signification, nor without design. And for this reason they (the Jews) had indeed the tithes of their goods consecrated to Him, but those who have received liberty set aside all their possessions for the Lord's purposes, bestowing joyfully and freely not the less valuable portions of their property, since they have the hope of better things [hereafter]; as that poor widow acted who cast all her living into the treasury of God.
Source: Adversus haereses (New Advent)