The Messenger of Allah ﷺ said: "The closest that a person can be to his Lord, the Mighty and Sublime, is when he is prostrating, so increase in supplication then."  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ أَقْرَبُ مَا يَكُونُ الْعَبْدُ مِنْ رَبِّهِ ﷻ وَهُوَ سَاجِدٌ فَأَكْثِرُوا الدُّعَاءَ