The opening of the chest of the Prophet pbuh there are two Hadith :
▪The first occurred when he was small and living among Banu Sa’d. It was narrated from Anas ibn Maalik RA that that Jibreel came to the Messenger of Allaah pbuh when he was playing with the other boys. He took hold of him and threw him to the ground, then he opened his chest and took out his heart, from which he took a clot of blood and said: “This was the Shaytaan’s share of you.” Then he washed it in a vessel of gold that was filled with Zamzam. Then he put it back together and returned it to its place. The boys went running to his mother – meaning his nurse – and said: Muhammad has been killed! They went to him and his colour had changed. Anas said: I used to see the mark of that stitching on his chest. (Muslim)
▪The second occurred on the night of the Isra’. Abu Dharr used to narrate that the Messenger of Allaah pbuh said: “The roof of my house was opened when I was in Makkah, and Jibreel pbuh came down and split open my chest, then he washed it with Zamzam water. Then he brought a golden basin filled with wisdom and faith and emptied it into my chest. Then he sealed it”. (Bukhaari and Muslim)
Hence, the above mentioned hadith is expressed by Prophet Muhammad pbuh, as it was difficult to believe and percieve at that time but now it is easy to understand in high-tech age, where heart transplantation or heart surgery are common. Many patients daily undergo for such opertion. The actual point is faith (belive in unseen) believe in Allah, Prophets, Angels, Books, Herafter and Destiny, so we believe in it as Allah has power over everything. However, Muslim acknowledge Prophet Muhammad pbuh as a messenger of Allah and seal of the prophets as well Muslims do not exaggerate the role of Prophet pbub nor worship him.
“Our Lord! Let not our hearts deviate (from the truth) after You have guided us, and grant us mercy from You. Truly, You are the Bestower” !