Sahih Bukhari; Hadith no: 527; Narrated / Authority of: Ibn Umar; Allah's Apostle said, "Whoever misses the 'Asr prayer (intentionally) then it is as if he lost his family and property."
Sahih Bukhari; Hadith no: 95; Narrated / Authority of: Anas; "Whenever the Prophet spoke a sentence (said a thing), he used to repeat it thrice so that the people could understand it properly from him and whenever he asked permission to enter, (he knocked the door) thrice with greeting."
“When my servants ask thee (O, Muhammad) concerning Me, tell them I am indeed close (to them). I listen to the prayer of every suppliant when he calleth on Me.” Qur’an:2:186