Hadith on Worship: Acts of worship spoiled by insincerity and sins

Ibn Umar reported: The Messenger of Allah, peace and blessings be upon him, said, “One who fasts might only acquire hunger and thirst from his fasting. One who stands for prayer might only acquire fatigue from his prayer.

Source: al-Mu’jam al-Kabīr 13412

Grade: Sahih (authentic) according to Al-Albani

عَنِ ابْنِ عُمَرَ قَالَ قَالَ رَسُولُ اللهِ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ رُبَّ صَائِمٍ حَظُّهُ مِنْ صِيَامِهِ الْجُوعُ وَالْعَطَشُ وَرُبَّ قَائِمٍ حَظُّهُ مِنْ قِيَامِهِ السَّهَرُ

13413 ‫المعجم الكبير للطبراني

1084 المحدث الألباني خلاصة حكم المحدث حسن صحيح في صحيح الترغيب