The narrowness of the chest while climbing the mount Everest

(125) So whoever AllŒh wants to guide – He expands his breast to [contain] IslŒm; and whoever He wants to send astray – He makes his breast tight and constricted as though he were climbing into the sky. Thus does AllŒh place defilement upon those who do not believe.

S´rah al-AnÔŒm - JuzÕ 8