مِنَ الْمُؤْمِنِيْنَ رِجَالٌ صَدَقُوْا مَا عَاهَدُوا اللّٰهَ عَلَيْهِ ۚ فَمِنْهُمْ مَّنْ قَضٰى نَحْبَهٗۙ وَمِنْهُمْ مَّنْ يَّنْتَظِرُ ۖوَمَا بَدَّلُوْا تَبْدِيْلًاۙ ( الأحزاب: ٢٣ )
Minal mu'mineena rijaalun sadaqoo maa 'aahadul laaha 'alaihi faminhum man qadaa nahbahoo wa minhum mai yantaziru wa maa baddaloo tabdeelaa (al-ʾAḥzāb 33:23)
Among the believers are men true to what they promised Allah. Among them is he who has fulfilled his vow [to the death], and among them is he who awaits [his chance]. And they did not alter [the terms of their commitment] by any alteration – (Al-Ahzab  : 23)
1 Mufti Taqi Usmani
Among the believers, there are men who came true to the covenant they had with Allah. So, some of them have fulfilled their vows (by sacrificing their lives in the way of Allah), and some of them are (still) waiting, and they did not change (their commitment) in the least.