﴿ وَيَقُولُ ٱلَّذِينَ ءَامَنُوٓا۟ أَهَٰٓؤُلَآءِ ٱلَّذِينَ أَقْسَمُوا۟ بِٱللَّهِ جَهْدَ أَيْمَٰنِهِمْ ۙ إِنَّهُمْ لَمَعَكُمْ ۚ حَبِطَتْ أَعْمَٰلُهُمْ فَأَصْبَحُوا۟ خَٰسِرِينَ ﴾

“while those who have attained to faith will say [to one another], "Are these the selfsame people who swore by God with their most solemn oaths that they were indeed with you? In vain are all their works, for now they are lost!"”

This has been clarified further in the third verse (53) where it was said that once the hypocricy of the hypocrites has been exposed and the reality behind their claims and oaths of friendship comes out in the open, Muslims would wonder if those were the people who used to assure them with sworn claims of their friendship and there they were all ruined as everything they did just to pretend had gone to waste. That Allah Jalla Sha'nuhu has mentioned the conquest of Makkah and the disgrace of the hypocrites in these verses was something which everyone saw only after a few days with their own eyes.