Performing prayers at specific times

It is a sin for a poet not to perform prayers intentionally within a certain period of time. And it is not acceptable to make mistakes every day. Allaah says (interpretation of the meaning): “So woe to those who are heedless of their prayers. Tafsir Abdullah bin Abbas (R.) says in the above verse those prayers are said, ‘those who perform the prayers late from the appointed time.’ (Tafsir Qurtubi, Volume: 20, Page: 211)