The Messenger of Allah (ﷺ) used to stand at night (in prayer) and recite this supplication after saying 'Allahu Akbar':
سُبْحَانَكَ اَللَّهُمَّ وَبِحَمْدِكَ وَتَبَارَكَ اسْمُكَ وَتَعَالَى جَدُّكَ وَلَا إِلَهَ غَيْرُكَ
سُبْحَانَكَ اَللّٰهُمَّ وَبِحَمْدِكَ وَتَبَارَكَ اسْمُكَ وَتَعَالٰى جَدُّكَ وَلَا اِلٰهَ غَيْرُكَ
Subhanaka Allaahumma wa bihamdika, wa tabaraka 'smuka, wa ta'ala jadduka, wa laa 'ilahaa ghayruk
Glory is to You O Allah, and praise. Blessed is Your Name and Exalted is Your Majesty. There is none worthy of worship but You.
Then he said this for three times -
لَا إِلَهَ إِلَّا اللَّهُ
لَا اِلٰهَ اِلَّا اللّٰهُ
Laa 'ilaaha 'illAllah
There is none worthy of worship but Allah.
Then he said this for three times -
اَللَّهُ أَكْبَرُ كَبِيرًا
اَللّٰهُ اَكْبَرُ كَبِيْرًا
Allahu 'Akbar Kabiran
Allah is the Greatest, Most Great.
Then he would say -
أَعُوْذُ بِاللَّهِ السَّمِيْعِ الْعَلِيْمِ مِنَ الشَّيْطَانِ الرَّجِيمِ مِنْ هَمْزِهِ وَنَفْخِهِ وَنَفْثِهِ
اَعُوْذُ بِاللّٰهِ السَّمِيْعِ الْعَلِيْمِ مِنَ الشَّيْطَانِ الرَّجِيْمِ مِنْ هَمْزِهٖ وَنَفْخِهٖ وَنَفْثِهٖ
A‛oodhu Billaahis Sami'il-Alimi minash-Shaytaanir-rajeem, min Hamzihi Wa Nafkhihi wa Nafthih
I seek refuge in Allah, the All-Hearing and the All-Knowing from the accursed devil, from his madness or evil suggestion (Hamz), from his puffing up (Nafkh), and from his witchcraft (Nafth).