Numbers 18:29

מכל מתנתיכם תרימו את כל תרומת ה׳ OUT OF ALL YOUR GIFTS YOU SHALL HEAVE EVERY HEAVE OFFERING UNTO THE LORD — Scripture is speaking here of the “Terumah Gedolah” (not of תרומת מעשר, for this is dealt with in verse 28); the meaning is, that if the Levite came to the field before the priest, when the grain has been made into a heap (i.e., after it has been threshed, when it becomes subject to the law of Terumah), and received his tithes before the priest took the Terumah Gedolah from the heap, the Levite must first set apart the fiftieth part (the usual proportion of the crop which the Israelite gives to the priest) of the tithe as “Terumah Gedolah” and then again set apart the תרומת מעשר (i.e. the tithe of his tithe) (Shabbat 127b).

מִכֹּל֙ מַתְּנֹ֣תֵיכֶ֔ם תָּרִ֕ימוּ אֵ֖ת כׇּל־תְּרוּמַ֣ת יְהֹוָ֑ה מִכׇּ֨ל־חֶלְבּ֔וֹ אֶֽת־מִקְדְּשׁ֖וֹ מִמֶּֽנּוּ׃

Out of all that is given to you, you shall set aside all that is due as a gift to the Lord, of all the best thereof, even the hallowed part of it.