משנה אויף דברי הימים א 28:17

There were thirteen chests in the Temple and on them was inscribed [respectively]:“new shekels”;“New shekels” those for each year; “old shekels”;“Old shekels” whoever has not paid his shekel in the past year may pay it in the coming year; “bird-offerings”;“Bird-offerings” these are turtle-doves; “young pigeons for burnt-offerings”;“Young pigeons for burnt-offerings” these are young pigeons. “wood”; “frankincense”; “gold for the kapporet”; and on six, “freewill offerings”. Both [these two chests] are for burnt-offerings, the words of Rabbi Judah. But the sages say: “bird-offerings” one [half] is for sin-offerings and the other [half] for burnt-offerings, but “young pigeons for burnt-offerings” all goes to burnt-offerings.