Commentary for Ketubot 198:13

ואילו גבי בעל הבית תניא תרם ועלה בידו אפילו אחד מעשרים תרומתו תרומה

While in respect of an owner it was taught: If, when setting apart terumah, there came up in his hand even so much as one twentieth his terumah is valid.

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