The text for a da capo aria was typically a poem or other verse sequence written in two strophes, the first for the A section (hence repeated later) and the second for B.
[1] This was especially so for da capo arias written in slower tempos, where the opportunity to improvise, as well as the risk of dullness, were greater.
The decline in this ability following the Baroque era is perhaps the reason why the da capo aria ultimately acquired a reputation as a musically dull form.
Handel's oratorio Messiah (1742) includes two well-known da capo arias, "He Was Despised" (for alto voice) and "The Trumpet Shall Sound" (for bass).
J. S. Bach's cantata Jauchzet Gott in allen Landen, BWV 51 (1730) begins with a flamboyant da capo aria for soprano, trumpet soloist, and strings.