Sayyiduna Abu Hurayrah (may Allah be pleased with him) reported about the Prophet (peace and blessings be upon him) that he used to offer two prayers together during a journey.
Imam al-Bazzar recorded it; its chain contains a narrator, Muhammad bin Aban al-Ju'fi, and he is da'if (weak).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الصلاة / 2967