فَابْدَؤُوا الْيَوْمَ، وَلَا تُؤَجِّلُوا الْخَيْرَ.
So begin today, and do not delay the good.
“Ibdʾū” is an imperative and “lā tuʾajjilū” a prohibitive. The first positively calls for beginning; the second blocks postponement. Together they turn the earlier reflection into an immediate behavioral recommendation.
A friendly exhortation does not create a legal obligation merely through an imperative form. Morphological identification and the speech act’s authority or force are separate questions.