A man stood on the day of Conquest (of Mecca) and said: Messenger of Allah, I have vowed to Allah that if He grants conquest of Mecca at your hands, I shall pray two rak'ahs in Jerusalem. He replied: Pray here. He repeated (his statement) to him and he said: Pray here. He again repeated (his statement) to him. He (the Prophet) replied: Pursue your own course, then. Abu Dawud said: A similar tradition has been narrated by 'Abd al-Rahman b. 'Awf from the Prophet ﷺ.  

يَا رَسُولَ اللَّهِ إِنِّي نَذَرْتُ لِلَّهِ إِنْ فَتَحَ اللَّهُ عَلَيْكَ مَكَّةَ أَنْ أُصَلِّيَ فِي بَيْتِ الْمَقْدِسِ رَكْعَتَيْنِ قَالَ صَلِّ هَا هُنَا ثُمَّ أَعَادَ عَلَيْهِ فَقَالَ صَلِّ هَا هُنَا ثُمَّ أَعَادَ عَلَيْهِ فَقَالَ شَأْنَكَ إِذًا  

"The Prophet ﷺ said: By Him Who sent Muhammad with truth, if you prayed here, this would be sufficient for you like the prayer in Jerusalem." Abu Dawud said: This tradition has also been transmitted by al-Ansari, from Ibn-Juraij. He said: Ja'far b. 'Umar and 'Amr b. Hayyah. He said: They transmitted from 'Abd al-Rahman b. 'Awf and from the Companions of the Prophet ﷺ.  

عَنْ رِجَالٍ مِنْ أَصْحَابِ النَّبِيِّ ﷺ بِهَذَا الْخَبَرِ زَادَ فَقَالَ النَّبِيُّ ﷺ وَالَّذِي بَعَثَ مُحَمَّدًا بِالْحَقِّ لَوْ صَلَّيْتَ هَا هُنَا لأَجْزَأَ عَنْكَ صَلاَةً فِي بَيْتِ الْمَقْدِسِ