וְנִסְכּוֹ֙ רְבִיעִ֣ת הַהִ֔ין לַכֶּ֖בֶשׂ הָאֶחָ֑ד בַּקֹּ֗דֶשׁ הַסֵּ֛ךְ נֶ֥סֶךְ שֵׁכָ֖ר לַיהוָֽה׃
And the drink-offering thereof shall be the fourth part of a hin for the one lamb; in the holy place shalt thou pour out a drink-offering of strong drink unto the LORD.
Read kabbalistic (mystical) interpretation of Numbers 28:7: and classical mystical sources.