Wa'alaykumus salaam warahmatullah
If you mean delay it so much that it becomes Qadhaa then yes it is sinful.
Salaah should be part of our routine and it brings a lot of barakah in our time. With winter coming up soon insha-allah it is very easy to wake up a little early and pray Fajr before starting with the day
This cannot be undone and I am sure it will be greatly appreciated.
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