Sayyiduna Abdullah bin Amr (may Allah be pleased with him) relates this saying of the Prophet (peace and blessings be upon him): "It is not lawful for a woman to be married on the (condition of the) divorce of another woman; it is not lawful for a man to sell over his companion's sale until the other leaves it; it is not lawful for three people who are in a desert land not to appoint one of them as their leader; and it is not lawful for three people who are alone (in a desert land) that two of them converse privately, leaving out the third."
Ahmad and al-Tabarani recorded it; its chain contains a narrator, Ibn Lahi'ah, and his hadith is hasan (fair). The rest of Ahmad's narrators are the narrators of the Sahih.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب البيوع / 6362
Hadith Gradingمحدثین:إسنادہ حسن
Hadith Takhrij«اخرجه احمد فى المسند (6647) ، أخرجه مسند أحمد برقم: 6609، وأخرجه المعجم الكبير للطبراني برقم: 8915»