Islam is a continuation of the legacy and message which all Prophets came with; starting with Adam all the way up to Ibrahim (the father of the Prophets), 'Isa and finally the Prophet Muhammad (may Allah bestow upon them blessings and peace).
•Belief in one Allah was the universal message of all Prophets.
•Salah (prayer) in principal was performed by all Prophets.
•Fasting was prescribed upon communities before this Ummah.
•There is no Prophet that came into this world save he had performed Hajj.
Also the Prophet صلى الله عليه وسلم is on record to have said:
إِنَّمَا بُعِثْتُ لِأُتَمِّمَ مَكَارِمَ الْأَخْلَاق (السلسة الصحيحة)
"Most certainly I have been sent to complete Excellence in character"
Furthermore, all of the Commands of Allah are for benefit (مصلحة) for the person in this world and the next. Every single Prohibition is to save a person from harm (مفسدة) in this world and the next
The commands and Prohibitions are founded upon the principal of acquiring benefit and saving oneself from harm in both worlds. By extension, in light of the above, we can understand the higher objectives (مقاصد الشريعة) which Islam aims at achieving and preserving through each and every command and prohibition. Namely; Protection of religion, wealth, progeny, intellect and honor. In other words the rules set out in Islam achieve the preservation of those matters aforementioned.