Mukhtasar Muslim (Abridged) 800 — Do not propose over your brother’s

'It is narrated from Abdur Rahman bin Shumasa that he heard Sayyiduna Uqbah bin Amir (may Allah be pleased with him) while he was saying on the pulpit: Indeed, the Messenger of Allah (peace and blessings be upon him) said: A believer is the brother of a believer. So it is not permissible for any believer to sell over the sale of his brother, nor is it permissible for him to propose (marriage) over the proposal of his brother, until he leaves it.'