to show respect. 

What supplication did the Prophet Muhammad (saw) teach his companions?
 Ibn 'Abbas reported that the Messenger of Allah (may peace he upon him) used to teach them this supplication (in the same spirit) with which he used to teach them a surah of the Qur'an. He would thus instruct us:                     " Say, O Allah I we seek refuge with Thee from the torment of Hell, and I seek refuge with Thee from the torment of the grave, and I seek refuge with Thee from the trial of Masih al-Dajjal. and I seek refuge with Thee from the trial of life and death." Muslim b. Hajjaj said: It has reached me that Tawus said to his son: Did you make this supplication in prayer? He said: No. (Upon this) he (Tawus) said: Repeat the prayer. Tawus has narrated this hadith through three or four (transmitters) with words to the same effect.