They are not only...
They are not only, now, but, until the advent of the Hereafter, the reminders of the holy Prophet (S). Some have also commented on it as being 'intercession', narrating a tradition from Imam Sadiq (as) in this connection, as a reference. Even, Fakhr-i-Razi has narrated fifteen different narrations on the meaning of 'Kawthar'.
But, it seems that most of them are the statements of the clear examples of this broad concept, because, as was mentioned before, 'Kawthar' means 'goodness and blessing in abundance', and we know that Allah, the Graceful, granted the holy Prophet (S) so many blessings so that each of those mentioned in the above is one clear example of them. There are also many other examples that may be cited as example commentaries for the verse.
However, all the divine gifts granted to the holy Prophet (S) in all aspects, even the victories in his expeditions against his enemies, and the scholars of his followers in the Muslim community, who guard the burning torch of Islam and Qur'an, in every period and age, and carry it throughout the world, all in all are involved in this 'abundance of good'.
It should not be forgotten that Allah revealed these verses to His Prophet's holy heart at the time when the manifestations of this 'abundance of good' had not yet appeared. It was a miraculous piece of news which informed about the near future and the remote future regarding the legitimacy of the holy Prophet (S).
This great blessing and the 'abundance of good' needs a lofty thankfulness, although creatures can never thank the Creator for His blessings, fully, because even the success of being thankful is another blessing from Him which needs thankfulness. When it is so; “Therefore to your Lord turn in prayer and Sacrifice".
Yes, He is the One Who grants these blessings, therefore, prayer, worship and sacrifice, which is also a kind of worship, itself, have no meaning save for Allah, particularly in regard to the meaning of the term Lord which indicates the constancy of grace, providence and Lordship of Providence. Briefly, 'worship', in the form of prayer or making a sacrifice, is only the Lord's and Benefactor's privilege, and it is exclusively for the Pure Supreme Being.
This refers to the behaviour of the pagans who used to prostrate and sacrifice to the idols while they knew their affluence belonged to Allah. and in any case, the phrase 'your Lord', used in the verse, is a clear evidence for the necessity of 'intention with divine motive' in worship.