The great sages were highly learned in Vedic knowledge. When they saw the male and female born of the arms of Vena's body, they were very pleased, for they could understand that the couple was an expansion of a plenary portion of Visnu, the SPG

Expressions researched:
"The great sages were highly learned in Vedic knowledge. When they saw the male and female born of the arms of Vena's body, they were very pleased, for they could understand that the couple was an expansion of a plenary portion of Viṣṇu, the Supreme Personality of Godhead"

Srimad-Bhagavatam

SB Canto 4

The great sages were highly learned in Vedic knowledge. When they saw the male and female born of the arms of Vena's body, they were very pleased, for they could understand that the couple was an expansion of a plenary portion of Viṣṇu, the Supreme Personality of Godhead.

SB 4.15.2, Translation and Purport

The great sages were highly learned in Vedic knowledge. When they saw the male and female born of the arms of Vena's body, they were very pleased, for they could understand that the couple was an expansion of a plenary portion of Viṣṇu, the Supreme Personality of Godhead.

The method adopted by the great sages and scholars, who were learned in Vedic knowledge, was perfect. They removed all the reactions of King Vena's sinful activities by seeing that King Vena first gave birth to Bāhuka, described in the previous chapter. After King Vena's body was thus purified, a male and female came out of it, and the great sages could understand that this was an expansion of Lord Viṣṇu. This expansion, of course, was not viṣṇu-tattva but a specifically empowered expansion of Lord Viṣṇu known as āveśa.