The Quran

۞ قالَتِ الأَعرابُ آمَنّا ۖ قُل لَم تُؤمِنوا وَلٰكِن قولوا أَسلَمنا وَلَمّا يَدخُلِ الإيمانُ في قُلوبِكُم ۖ وَإِن تُطيعُوا اللَّهَ وَرَسولَهُ لا يَلِتكُم مِن أَعمالِكُم شَيئًا ۚ إِنَّ اللَّهَ غَفورٌ رَحيمٌ

Muhammad Asad

THE BEDOUIN say, "We have attained to faith." Say [unto them, O Muhammad]: "You have not [yet] attained to faith; you should [rather] say, 'We have [outwardly] surrendered' - for [true] faith has not yet entered your hearts.¹ But if you [truly] pay heed unto God and His Apostle, He will not let the least of your deeds² go to waste: for, behold, God is much-forgiving, a dispenser of grace."

Inasmuch as this is evidently an allusion to the intense tribalism of the bedouin and their "pride of descent" (Razi), the above verse connects with the preceding condemnation of all tribal preferences and prejudices, and with the call for their abandonment as a prerequisite of true faith. Primarily, this relates to the bedouin contemporaries of the Prophet, but its import is general and timeless.
I.e., "your own deeds, in distinction from the supposed 'glorious deeds' of your ancestors, which count for nothing in His sight".