Here are a few simple condolence messages you can use for your friend’s father. You can keep them as they are or adjust them to sound more like you.

1. “I am deeply sorry to hear about your father’s passing. He was a wonderful person, and his memories will always remain alive through the good deeds he has done. Praying that you and your family find strength and peace in this difficult time.”

1. “Your father lived a meaningful life and touched many hearts. May his soul progress on the path of peace and may you find the strength to bear this loss. My heartfelt condolences to you and your family.”

1. “I was very saddened to hear about your father. Please accept my sincere condolences. May his soul attain shanti, and may you and your family be blessed with courage in this painful time.”

1. “Losing a parent is one of the deepest pains. I am truly sorry for your loss. May the cherished memories of your father give you strength, and may his soul continue its journey towards peace and purity.”

1. (Short and simple)

“I am so sorry for your loss. My prayers and thoughts are with you and your family. May your father’s soul rest in peace.”

If you tell me whether you want it more formal or more personal (for WhatsApp / card, etc.), I can write a single, perfect message you can directly send.