God spoke to Moses, telling him to Vayedaber Adonay el-Moshe lemor.
18:26
speak to the Levites and say to them:
When you take from the Israelites the tithe that I have given you as your inheritance from them, you must separate from it an elevated gift to God, a tithe of the tithe.
This [tithe given to you by the Israelites] is your own elevated gift. and it is exactly like grain from the threshing floor or wine from the vat. Venechshav lachem trumatchem kadagan min-hagoren vechamle'ah min-hayakev.
Commentary:
a tithe of the tithe The Levites had to take a tenth of their tithe which in turn was one tenth of the Israelite's produce. Hence this 'terumath maaser' was 1% of the produce.
This tithe... Or, 'That which you give as an elevated gift [to the priest] shall be considered like [the elevated gift] taken from... (Rashi).
wine Meleah in Hebrew, see Exodus 22:8. Or, 'best wine' (Saadia; cf. Targum Yonathan), or, 'offerings' (Septuagint).
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