Which sutta is this excerpt about Buddha's death from?

An ordained Bhikkhu shared the following with me. > "You have done what is good and wholesome, you have made a shelter > from fear. You have not done anything to harm other. You have not been > greedy and immoral. You have forgiven the world difficult life > pleasure and pain with compassion and after death you will be reborn > in a happy destination." … said Buddha before death when he invited > all the monks and followers to come and watch how the noble one dies. I do not know if he paraphrased and I could not find it with a Google search... he was saying the idea that Buddha died from eating bad pork was incorrect. He was vaguely referencing mushrooms as a possible cause and then also mentioned that Buddha died through some supernatural phenomenon and this was in some Pali sutta. I was wondering if anyone knew where this quote is from (and hence the rest of the story)?