Dr Saab, they do not need the Quran to explain namaz, nor the hadith, but only traditions handed down from the last Messenger who either received it from revelation not needed to be recorded in the Quran, or he learnt it from those who followed the traditions handed down from Abraham.!!!!!!!!!!!!
The last Messenger only followed Quran, so other ancestors introduced the physical ritual prayer which means they do something that relies on their ancestors from 1200 years ago or 3500 years ago:
2:170 When it is said to them, "Follow what God has revealed", they say, "Nay! We will follow the ways of our ancestors.” What! Even though their ancestors (and the ancient Imams) were lacking in understanding and were not rightly guided? [5:104, 10:78, 11:62, 11:87, 21:53, 34:43, 38:7, 43:23. Hudan and derivatives = Prominent = Bright = Lighted = Clearly visible = Leading = Guidance = Lighthouse = A well-lit road = A landmark of identification in the desert or sea]
2:171 The likeness of such blind followers is that (of a herd of sheep) which hear the shepherd’s call, but hear in it nothing more than a sound and a shout. Deaf, dumb, blind, for they do not use their reason. [This is subhuman level of existence 7:179. ‘Unq = Shepherd’s call. Shepherd here pertains to religious leaders who have learned some meaningless words or tenets, and a herd of sheep is the masses that blindly follow them. Kufr embraces blind following in addition to denying, opposing, or concealing the truth. Perceptual senses alone cannot distinguish human beings from the rest of the animal kingdom. It is the intellectual analysis that sets them apart]