Being an ordinary living entity, he (Indra) became envious of King Prthu, and, making himself invisible, he stole the horse and thus impeded the yajna performance

Expressions researched:
"Being an ordinary living entity, he became envious of King Pṛthu, and, making himself invisible, he stole the horse and thus impeded the yajña performance"

Srimad-Bhagavatam

SB Canto 4

When King Pṛthu was performing one hundred yajñas, Indra became very envious because he did not want anyone to excel him. Being an ordinary living entity, he became envious of King Pṛthu, and, making himself invisible, he stole the horse and thus impeded the yajña performance.

SB 4.19.11, Translation and Purport

When Pṛthu Mahārāja was performing the last horse sacrifice [aśvamedha-yajña], King Indra, invisible to everyone, stole the horse intended for sacrifice. He did this because of his great envy of King Pṛthu.

King Indra is known as śata-kratu, which indicates that he has performed one hundred horse sacrifices (aśvamedha-yajña). We should know, however, that the animals sacrificed in the yajña were not killed. If the Vedic mantras were properly pronounced during the sacrifice, the animal sacrificed would come out again with a new life. That is the test for a successful yajña. When King Pṛthu was performing one hundred yajñas, Indra became very envious because he did not want anyone to excel him. Being an ordinary living entity, he became envious of King Pṛthu, and, making himself invisible, he stole the horse and thus impeded the yajña performance.