According to tradition, in 617 the leaders of Makhzum and Banu Abd-Shams, two important clans of Quraysh, declared a public boycott against the clan of Banu Hashim, their commercial rival, in order to put pressure on the clan to withdraw its protection from Muhammad. The terms imposed on Banu Hashim, as reported by Ibn Ishaq, were "that no one should marry their women nor give women for them to marry; and that no one should either buy from them or sell to them, and when they agreed on that they wrote it in a deed." The boycott lasted for two or three years but eventually collapsed mainly because it was not achieving its purpose; the boycott had caused extreme privation and the sympathizers within the Quraysh finally united to annul the agreement.