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It was narrated that Abu Hurairah said: "I heard the Messenger of Allah (ﷺ) say: 'The parable of a Mujahid who strives in the cause of Allah - and Allah knows best who in His cause - is that of one who fasts, prays Qiyam, focuses with proper humility, bows and prostrates.'"
Source: sunnah.com
Other translations
Arabic
أَخْبَرَنَا هَنَّادُ بْنُ السَّرِيِّ، عَنِ ابْنِ الْمُبَارَكِ، عَنْ مَعْمَرٍ، عَنِ الزُّهْرِيِّ، عَنْ سَعِيدِ بْنِ الْمُسَيَّبِ، عَنْ أَبِي هُرَيْرَةَ، قَالَ سَمِعْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم يَقُولُ " مَثَلُ الْمُجَاهِدِ فِي سَبِيلِ اللَّهِ - وَاللَّهُ أَعْلَمُ بِمَنْ يُجَاهِدُ فِي سَبِيلِهِ - كَمَثَلِ الصَّائِمِ الْقَائِمِ الْخَاشِعِ الرَّاكِعِ السَّاجِدِ " .
sunnah.com