Just to expand Himself according to His transcendental features, the Lord begot in each and every one of them ten offspring with exactly His own qualities.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
तास्वपत्यान्यजनयदात्मतुल्यानि सर्वतः । एकैकस्यां दश दश प्रकृतेर्विबुभूषया
tāsvapatyānyajanayadātmatulyāni sarvataḥ | ekaikasyāṃ daśa daśa prakṛtervibubhūṣayā
SB 3.3.9