The Supreme Personality of Godhead descended to kill the demoniac kings who were the burden of the earth and to protect the saintly devotees. However, both the demons and the devotees are awarded liberation by the Lord’s mercy. Thus, His transcendental fame has spread throughout the universe.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
भूभारासुरराजन्यहन्तवे गुप्तये सताम् । अवतीर्णस्य निर्वृत्यै यशो लोके वितन्यते
bhūbhārāsurarājanyahantave guptaye satām | avatīrṇasya nirvṛtyai yaśo loke vitanyate
SB 11.5.50