For Marriage
It is a very suitable case. Before marriage, state all your words and the principles you are committed to. Insha'Allah, you will find a blessed end.
For Business / Deal
Perform it according to the conditions you have in mind; you will earn a good profit and your credit/reputation will increase.
مِّنَ الْمُؤْمِنِينَ رِجَالٌ صَدَقُوا مَا عَاهَدُوا اللَّهَ عَلَيْهِ ۖ فَمِنْهُم مَّن قَضَىٰ نَحْبَهُ وَمِنْهُم مَّن يَنتَظِرُ ۖ وَمَا بَدَّلُوا تَبْدِيلًا
Mina almumineena rijalun sadaqoo ma AAahadoo Allaha AAalayhi faminhum man qada nahbahu waminhum man yantathiru wama baddaloo tabdeelan
Among the Believers are men who have been true to their covenant with Allah: of them some have completed their vow (to the extreme), and some (still) wait: but they have never changed (their determination) in the least:
