Messenger of Allah narrated that Allah, Blessed and Most High said: "Son of Adam: Perform four Rak'ah for Me in the beginning of the day it will suffice you for the latter part of it." (Using translation from Tirmidhī 475)
عَنْ رَسُولِ اللَّهِ ﷺ أَنَّهُ قَالَ قَالَ اللَّهُ ﷻ صَلِّ لِي ابْنَ آدَمَ أَرْبَعَ رَكَعَاتٍ فِي أَوَّلِ النَّهَارِ أَكْفِكَ آخِرَهُ