Which poetic device is seen in the lines "to whirl and dance till the whit day is done."?

i need some details.

i have identified the gerund in this sentence by writing it in all capitals.

gerund phrase: writing it in all capitals

gerund use: object of preposition

the verbal in this sentence is an infinitive. when you want to know the reason of an action, you simply ask the question "why? ". once you know the reason you can answer with "because".

many times we don´t use the word "because" but we can use another expression and that is an "infinitive of purpose". example:

-why did your brother bring a book?

-he brought a book to study.

in the answer above you can see an example of an infinitive sentence, just like in the example of your text. "he couldn´t run fast enough to beat his older sister". so, the answer is infinitive.