Musar do Liczb 18:12
כֹּ֚ל חֵ֣לֶב יִצְהָ֔ר וְכָל־חֵ֖לֶב תִּיר֣וֹשׁ וְדָגָ֑ן רֵאשִׁיתָ֛ם אֲשֶׁר־יִתְּנ֥וּ לַֽיהוָ֖ה לְךָ֥ נְתַתִּֽים׃
Wszystko co najprzedniejsze z oliwy, i wszystko co najprzedniejsze z moszczu i zboża, pierwociny, które składają Wiekuistemu, - tobie je oddaję;
Shenei Luchot HaBerit
כל חלב יצהר וכל חלב תירוש ודגן . "All the best of the new oil, wine, grain, etc." We have the Torah on record here that he who gives the Priests his dues should give them of the best of his respective produce to show that he wishes to fulfill that commandment sincerely. Similarly, when giving charity, [at a time when the coins in circulation sometimes had worn off and their value was somewhat questionable] he should give only coins which are in mint condition.
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