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Umm Farwah - and she was one of those who gave pledge of allegiance to the Prophet - narrated:

"The Prophet was asked: 'Which deed is the best?' So he said: 'Salat in the beginning of its time.'"
حَدَّثَنَا أَبُو عَمَّارٍ الْحُسَيْنُ بْنُ حُرَيْثٍ، حَدَّثَنَا الْفَضْلُ بْنُ مُوسَى، عَنْ عَبْدِ اللَّهِ بْنِ عُمَرَ الْعُمَرِيِّ، عَنِ الْقَاسِمِ بْنِ غَنَّامٍ، عَنْ عَمَّتِهِ أُمِّ فَرْوَةَ، وَكَانَتْ، مِمَّنْ بَايَعَتِ النَّبِيَّ صلى الله عليه وسلم قَالَتْ سُئِلَ النَّبِيُّ صلى الله عليه وسلم أَىُّ الأَعْمَالِ أَفْضَلُ قَالَ ‏ "‏ الصَّلاَةُ لأَوَّلِ وَقْتِهَا ‏"‏ ‏.‏

Classification

Sahih (Authentic)

References

• Jami` at-Tirmidhi, Vol. 1, Book of Salat, Hadith 170
• Jami` at-Tirmidhi, Book of Salat, Hadith 170