Sayyiduna Abdullah bin Amr (may Allah be pleased with him) reports that the Prophet (peace and blessings be upon him) said: "Standing guard (ribat) for one day is better than a month of voluntary fasting and night prayers."
Ahmad recorded it; its chain contains Ibn Lahi'ah, whose hadith is hasan (good), though there is weakness in him.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الجهاد / 9494
Hadith Gradingمحدثین:إسنادہ حسن
Hadith Takhrij«اخرجه احمد فى المسند (6653) ، أخرجه مسند أحمد برقم: 6615»