question #1 Sahih al-Bukhari 1199, Book 21, Hadith 2 : What is the significance of maintaining focus and avoiding distractions during prayer in Islam?

We used to greet the Prophet (ﷺ) while he was praying and he used to answer our greetings. When we
returned from An-Najashi (the ruler of Ethiopia), we greeted him, but he did not answer us (during the
prayer) and (after finishing the prayer) he said, “In the prayer one is occupied (with a more serious
matter).”