Bali Maharaja and Indra were enemies. Therefore, when Brhaspati, the spiritual master of the demigods, predicted that Bali Maharaja would be vanquished when he insulted the brahmanas by whose grace he had become so powerful, Bali Maharaja’s enemies were naturally anxious to know when that opportune moment would come. To pacify King Indra, Brhaspati assured him that the time would certainly come, for Brhaspati could see that in the future Bali Maharaja would defy the orders of Sukracarya in order to pacify Lord Vishnu, Vamanadeva. Of course, to advance in Krishna consciousness, one can take all risks. To please Vamanadeva, Bali Maharaja risked defying the orders of his spiritual master, Sukracarya. Because of this, he would lose all his property, yet because of devotional service to the Lord, he would get more than he expected, and in the future, in the eighth manvantara, he would occupy the throne of Indra again.
Source: A.C. Bhaktivedanta Swami Prabhupada (2014 edition), “Srimad Bhagavatam”, Eighth Canto, Chapter 15 – Text 31