If the din were at the Pleiades, even then a person from Persia would have taken hold of it, or one amongst the Persian descent would have surely found it.  

قَالَ رَسُولُ اللَّهِ ﷺ لَوْ كَانَ الدِّينُ عِنْدَ الثُّرَيَّا لَذَهَبَ بِهِ رَجُلٌ مِنْ فَارِسَ أَوْ قَالَ مِنْ أَبْنَاءِ فَارِسَ حَتَّى يَتَنَاوَلَهُ  

If the din were at the Pleiades, even then a person from Persia would have taken hold of it, or one amongst the Persian descent would have surely found it. (Using translation from Muslim 2546a)  

قَالَ رَسُولُ اللهِ ﷺ لَوْ كَانَ الدِّينُ عِنْدَ الثُّرَيَّا لَذَهَبَ رِجَالٌ مِنْ فَارِسَ أَوْ أَبْنَاءِ فَارِسَ حَتَّى يَتَنَاوَلُوهُ  

"لَوْ كَانَ الإِيمَانُ عِنْدَ الثُّرَيَّا لَتَنَاوَلَهُ رِجَالٌ مِنْ فَارِسَ".  

"لَوْ كَانَ العِلمُ بِالثُّرَيَّا لَتَنَاوَلَهُ رجَالٌ مِنْ أبنَاءِ فَارِسَ".