It is narrated from Hazrat Umm Salamah (may Allah be pleased with her) that the Prophet (peace and blessings be upon him) used to perform Witr with seven or five rak‘ahs, and he would not separate them with salam or speech in any way.
Hadith Referenceمسند احمد / مسند النساء / 26725
Hadith Gradingحکم دارالسلام:إسناده ضعيف لانقطاعه، مقسم لم يسمع من أم سلمة ، وقد اختلف فى إسناده