508 — They unanimously agree that when the lender stipulates (1) one-tenth of the loan as a gift or an additional payment, and the borrower accepts on that basis, the lender’s taking of that extra portion is riba (usury).

Book of Pre-emption (Shufʿah)

509 — They unanimously agree that the right of pre-emption is established for the co-owner whose share has not yet been divided with respect to whatever portion of land, house, or wall has been sold (2).

510 — They unanimously agree that if someone purchases a share of jointly owned land and some partners waive their right of pre-emption while others wish to exercise it, whoever wishes to exercise the right must take the entire purchased share or leave it altogether; he may not take only a portion equal to his own share and leave the remainder (3).

511 — They unanimously agree that the guardian (waṣī) may exercise the right of pre-emption on behalf of a minor. Al-Awzāʿī alone dissented, saying: “The minor must reach puberty and then exercise it himself.”