Peace Yuliana.
I believe "salat" is preserved from Abraham. Including the units.
Qoran corrected only what was corrupted/lost...
[Quran 21:73] We made them imams who guided in accordance with our commandments, and we taught them how to work righteousness, and how to observe the Salat and the obligatory charity (Zakat)....
In fact, according to the Quran, Islam is called the religion of Abraham, and Muhammad was a follower of Abraham. So were Isaac, Ismail, Jacob, Moses, Aaron, Jesus, and other messengers of God.
Abraham was indeed an exemplary vanguard in his submission to God, a monotheist who never worshiped idols. Because he was appreciative of His Lord's blessings, He chose him and guided him in a straight path. We granted him happiness in this life, and in the Hereafter he will be with the righteous. Then we inspired you (Muhammad) to follow the religion of Abraham, the monotheist; he never was an idol worshiper. (16:120-123)
The practices have been preserved in their basic form since the time of Abraham despite the efforts of corruption and distortion by idol worshipers and disbelievers. Each messenger who came after Abraham purified and followed these practices in accordance .
That is my understanding.
GOD bless you.
Peace.