It is narrated from Sayyiduna Suhayb (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "A man's performing a voluntary prayer in a place (in seclusion and solitude) where people do not see him carries twenty-five times more merit and reward than his praying (openly) in the presence of people."
Imam Abu Ya'la recorded this hadith in his Musnad, and Allamah al-Haythami declared its narrators thiqat (trustworthy) in Majma' al-Zawa'id.
Hadith Referenceالمطالب العالية بزوائد المسانيد الثمانية / كتاب النوافل / 574
Hadith Gradingمحدثین:إسناده ضعيف
Hadith Takhrij«حکم الحدیث المطالب العالیہ محققاً تنسیق د. سعد بن ناصر بن عبد العزيز الشَّثري- مکتبہ شاملہ :إسناده ضعيف. » «انفرد به المصنف من هذا الطريق»