[If] the householder says, “for a sela,” and another says, “for a sela,” the householder has precedence, since he adds a fifth. [If] the householder says, “for a sela,” and another says, “for a sela and an issar,” [he] of the sela and an issar has priority, since he adds to the principal. One who redeems his own maaser sheni adds to it a fifth, whether it is his or whether it was given to him as a gift.