Is it allowed to say thanks and sorry to a person for his favour or your mistakes?

Question

I want to know like some person give me water when I was thirsty , so I thanked Allah for water and thanked the person too , I realised I should not say thanks to a non muslim or muslim I have to say may Allah bless you , is that right (similar case for sorry ) or I am allowed to say thanks and sorry ?

Answer 1

There's a hadith which strongly encourages being grateful to people:

Whoever is not grateful to the people, he is not grateful to Allah.
_{Jami` at-Tirmidhi 1955 [grade: sahih]}

He who does not thank the people is not thankful to Allah.
_{Sunan Abi Dawud 4811 [grade: sahih]}

And a hadith which strongly encourages seeking forgiveness from people:

Whoever has wronged his brother, should ask for his pardon ...
_{Sahih al-Bukhari 6534}

These ahadith are among many others which implore good manners in general:

The most beloved to me amongst you is the one who has the best character and manners.
_{Sahih al-Bukhari 3759, 3760}

And there doesn't seem to be a major distinction between Muslims and non-Muslims (It is incumbent on the Muslim to seek forgiveness from the non-Muslim IslamWeb; see also IslamWeb).