Ezekiel 46:5

And the meat offering shall be an ephah for a ram, and the meat offering for the lambs as he shall be able to give, and an hin of oil to an ephah.

Cross-reference

Ezekiel 46:11 extends the same grain offering proportions to all appointed feasts.

Ezekiel 45:24 specifies similar grain offerings for the feast, with oil measures added.

Deuteronomy 16:17 uses the same 'as he is able' principle for giving at feasts.

Numbers 15:9 gives grain offering proportions for a bull (three tenths ephah, half hin oil), paralleling the structure here for a ram but with different amounts.