Lord Brahma addressed them thus: My dear sacrificial performers, you cannot kill Indra, the King of heaven. It is not your duty. You should know that Indra is as good as the SPG. Indeed, he is one of the most powerful assistants of the PG

Expressions researched:
"Lord Brahmā addressed them thus: My dear sacrificial performers, you cannot kill Indra, the King of heaven. It is not your duty. You should know that Indra is as good as the Supreme Personality of Godhead. Indeed, he is one of the most powerful assistants of the Personality of Godhead"

Srimad-Bhagavatam

SB Canto 4

Lord Brahmā addressed them thus: My dear sacrificial performers, you cannot kill Indra, the King of heaven. It is not your duty. You should know that Indra is as good as the Supreme Personality of Godhead. Indeed, he is one of the most powerful assistants of the Personality of Godhead.

SB 4.19.30, Translation

Lord Brahmā addressed them thus: My dear sacrificial performers, you cannot kill Indra, the King of heaven. It is not your duty. You should know that Indra is as good as the Supreme Personality of Godhead. Indeed, he is one of the most powerful assistants of the Personality of Godhead. You are trying to satisfy all the demigods by the performance of this yajña, but you should know that all these demigods are but parts and parcels of Indra, the King of heaven. How, then, can you kill him in this great sacrifice?