Can I pray to get married to someone I really like( even though he is unaware of this). Please suggest any specific dua aur amal since I really want to get married to this person and not anyone else. There are absolutely no haram relationships between us we just know each other and that's it

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Yes it is permissible for you to make that prayer. You can recite this Dua:

اللَّهُمَّ رَبَّ السَّمَاوَاتِ السَّبْعِ وَ مَا بَيْنَهُنَّ وَ رَبَّ الْعَرْشِ الْعَظِيمِ، وَ رَبَّ جَبْرَئِيلَ وَ مِيكَائِيلَ وَ إِسْرَافِيلَ، وَ رَبَّ الْقُرْآنِ الْعَظِيمِ، وَ رَبَّ مُحَمَّدٍ خَاتَمِ النَّبِيِّينَ ، إِنِّي أَسْأَلُكَ بِالَّذِي تَقُومُ بِهِ السَّمَاءَ، وَ بِهِ تَقُومُ الْأَرْضَ، وَ بِهِ تُفَرِّقُ بَيْنَ الْجَمْعِ، وَ بِهِ تَجْمَعُ بَيْنَ الْمُتَفَرِّقِ، وَ بِهِ تَرْزُقُ الْأَحْيَاءَ، وَ بِهِ أَحْصَيْتَ عَدَدَ الرِّمَالِ وَ وَزْنَ الْجِبَالِ وَ كَيْلَ الْبُحُورِ

Then say salawat and ask Allah for this.