The nearest a servant come to his Lord is when he is prostrating himself, so make supplication often.  

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

The Prophet ﷺ lifted the curtain (and saw that) the people were standing in rows(of prayers) behind Abu Bakr. He said: O people, there remained nothing that gives good tidings from prophethood except a true dream which a Muslim has himself or which another Muslim has for him. I have been prohibited to recite the Qur’an while bowing or prostration. As regards owing, exalt the Lord in it, and as to prostration, make supplication with exertion in it, that is worthy of being accepted.  

أَنَّ النَّبِيَّ ﷺ كَشَفَ السِّتَارَةَ وَالنَّاسُ صُفُوفٌ خَلْفَ أَبِي بَكْرٍ فَقَالَ يَا أَيُّهَا النَّاسُ إِنَّهُ لَمْ يَبْقَ مِنْ مُبَشِّرَاتِ النُّبُوَّةِ إِلاَّ الرُّؤْيَا الصَّالِحَةُ يَرَاهَا الْمُسْلِمُ أَوْ تُرَى لَهُ وَإِنِّي نُهِيتُ أَنْ أَقْرَأَ رَاكِعًا أَوْ سَاجِدًا فَأَمَّا الرُّكُوعُ فَعَظِّمُوا الرَّبَّ فِيهِ وَأَمَّا السُّجُودُ فَاجْتَهِدُوا فِي الدُّعَاءِ فَقَمِنٌ أَنْ يُسْتَجَابَ لَكُمْ  

The Messenger of Allah ﷺ often said while bowing and prostrating himself; “Glory be to Thee, O Allah, out Lord.” And “Praise be to Thee, O Allah, forgive me,” Thus interpreting the (command in the Qur’an).  

كَانَ رَسُولُ اللَّهِ ﷺ يُكْثِرُ أَنْ يَقُولَ فِي رُكُوعِهِ وَسُجُودِهِ سُبْحَانَكَ اللَّهُمَّ رَبَّنَا وَبِحَمْدِكَ اللَّهُمَّ اغْفِرْ لِي يَتَأَوَّلُ الْقُرْآنَ  

The prophet ﷺ used to say when prostrating himself: “O Allah. Forgive me all my sins, small and great, first and last. “ the narrator Ibn al-sarh added: “open and secret.”  

أَنَّ النَّبِيَّ ﷺ كَانَ يَقُولُ فِي سُجُودِهِ اللَّهُمَّ اغْفِرْ لِي ذَنْبِي كُلَّهُ دِقَّهُ وَجِلَّهُ وَأَوَّلَهُ وَآخِرَهُ زَادَ ابْنُ السَّرْحِ عَلاَنِيَتَهُ وَسِرَّهُ  

”(O Allah), I seek refuge in Your good pleasure from Your anger, and in Your Mercy from Your Punishment, and I seek refuge from You in You; I am not able to praise You (the way that You deserve to be praised), for You are as You have praised Yourself”.  

فَقَدْتُ رَسُولَ اللَّهِ ﷺ ذَاتَ لَيْلَةٍ فَلَمَسْتُ الْمَسْجِدَ فَإِذَا هُوَ سَاجِدٌ وَقَدَمَاهُ مَنْصُوبَتَانِ وَهُوَ يَقُولُ أَعُوذُ بِرِضَاكَ مِنْ سَخَطِكَ وَأَعُوذُ بِمُعَافَاتِكَ مِنْ عُقُوبَتِكَ وَأَعُوذُ بِكَ مِنْكَ لاَ أُحْصِي ثَنَاءً عَلَيْكَ أَنْتَ كَمَا أَثْنَيْتَ عَلَى نَفْسِكَ