Talmud for Terumot 4:5
הַמַּרְבֶּה בִּתְרוּמָה, רַבִּי אֱלִיעֶזֶר אוֹמֵר, אֶחָד מֵעֲשָׂרָה, כִּתְרוּמַת מַעֲשֵׂר, יָתֵר מִכָּאן, יַעֲשֶׂנָּה תְּרוּמַת מַעֲשֵׂר לְמָקוֹם אַחֵר. רַבִּי יִשְׁמָעֵאל אוֹמֵר, מֶחֱצָה חֻלִּין וּמֶחֱצָה תְּרוּמָה. רַבִּי טַרְפוֹן וְרַבִּי עֲקִיבָא אוֹמְרִים, עַד שֶׁיְּשַׁיֵּר שָׁם חֻלִּין:
One who gives more <i>Terumah</i>: Rabbi Eliezer says: [he may give up to] one out of ten, as in the case of <i>Terumat Ma'aser</i> [a portion of the tithes that is given to the priest]. [If he gave] more than this, he must make [the extra into] <i>Terumat Ma'aser</i> for other produce. Rabbi Yishmael says: [he may give up until the mixture is] half <i>Chulin</i> [non-sacred produce] and half <i>Terumah</i>. Rabbi Tarfon and Rabbi Akiva say: [he may give] as long as there remains [enough to carry] the name of <i>Chulin</i>.