Yechiel Michel Epstein

“ Section 5 According to me, how can you say that there is no (Scriptural) commandment to pray to our father in heaven? Isn't Avodah (worship in the Holy Temple) is one of the three pillars of the world's existence! {Pirkei Avoth) !? (However) because of our many sins today, we do not have the Holy Temple, the only reminent of worship is prayer.
We are like servants in the hands of our masters. How can (one) say that you are not obligated to pray to God every day?
Furthermore, I will bring a proof from the Ramban himself that prayer is a Scriptural commandment. ”

“ Section 16 The Beit Yosef writes the following:
Since the crack of dawn is the point where one may pray, it is forbidden for one to say "Shalom" (hello) to his fellow (before one prays) . However, it is permitted to say "good morning" (to his fellow) . However, even this language (of good morning) is not permitted except if one happens to be going about some business (and bumps into his friend) . If however, he specifically goes to greet his friend, even saying (good morning) , is prohibited. It is also prohibited to bow to his fellow when he greets his friend. ”

“ There are two aspects of the obligation of prayer: 1) the time that one prays 2) the actual obligation to pray. If one prayed between the fourth hour and midday, they only receive the second of the two aspects: the reward for praying.)
The Rambam also writes similarly. The Tur says the following:
If one accidently did not pray and the fourth hour had passed- they may pray until midday. (If one does this,) they do not recieve the reward for praying at the correct time, but they do receive the reward for praying. ”