A letter to your friend inviting him to the marriage ceremony of your elder sister.

Dear Nusrat,

I hope you're doing well. Sending you my warm greetings. I'm fine too, thanks to the blessings of Allah. I have some exciting news to share with you. My sister's wedding will take place next Sunday. All my friends will be there, and I'd really like you to be a part of this joyous occasion. Could you please come to our house three days before the wedding? 

Sending my best wishes to you and your loved ones. Let's catch up more when we can meet in person.

Take care,

Nawsin Rahman