Amr b. Shu'aib on his father's authority said that his grandfather (Abdullah ibn Amr ibn al-'As):The Prophet (ﷺ) said: There is no divorce except in what you possess; there is no possession, there is no sale transaction till you possess. The narrator Ibn as-Sabbah added: There is no fulfilling a vow till you possess

English translation · Sunan Abu Dawud