DOES IT MAKE ANY SENSE THAT GOD WOULD ISSUE A COMMANDMENT TO OBSERVE SOMETHING NOT ALREADY KNOWN ??? "...and keep the observance of Salat and Zakat, and lend to God a loan of righteousness. Whatever you advance for your souls, you will find at God better and multiplied manyfold. And seek God's forgiveness; God is forgiving, merciful." (73:20) The word "Salat" is very specific and means only one thing, i.e., the observance of specific practices involving bowing and prostration. This is true throughout Quran, throughout the ages, and in relation to any prophet, messenger, etc.