Terumos3: 6
הַמַּקְדִים תְּרוּמָה לְבִכּוּרִים, מַעֲשֵׂר רִאשׁוֹן לִתְרוּמָה, וּמַעֲשֵׂר שֵׁנִי לְרִאשׁוֹן, אַף עַל פִּי שֶׁהוּא עוֹבֵר בְּלֹא תַעֲשֶׂה, מַה שֶּׁעָשָׂה עָשׂוּי, שֶׁנֶּאֱמַר: ,,מְלֵאָתְךָ וְדִמְעֲךָ לֹא תְאַחֵר”.
[If] one separates terumah before bikkurim, maaser rishon before terumah, [or] maaser sheni before [maaser] rishon, alt-hough he violates a negative commandment, what he did is done, As it is stated: Do not delay your fullness-offering or your “dema.”