All the ṛṣis, Manus, demigods and descendants of Manu, who are especially powerful, are plenary portions or portions of the plenary portions of the Lord. This also includes the Prajāpatis.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
ऋषयो मनवो देवा मनुपुत्रा महौजसः । कलाः सर्वे हरेरेव सप्रजापतयस्तथा
ṛṣayo manavo devā manuputrā mahaujasaḥ | kalāḥ sarve harereva saprajāpatayastathā
SB 1.3.27