Answer:
I donβt forget!
I know a word of letters three. Add two and fewer there will be. What is the word?
I may only be given but never bought. Sinners seek me but saints do not. (one word).
A woman shoots her husband. Then she holds him underwater for five minutes. Next she hangs him. Right after she feeds him dinner. How can this be?
I have all the knowledge you have. But I am so small that I can fit into your hands. What am I?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.