for the protection — SB 4.8.7plugin-autotooltip__small plugin-autotooltip_bigŚrīmad Bhāgavatam 4.8.7

Svāyambhuva Manu had two sons by his wife, Śatarūpā, and the names of the sons were Uttānapāda and Priyavrata. Because both of them were descendants of a plenary expansion of Vāsudeva, the Supreme Personality of Godhead, they were very competent to rule the universe to maintain and protect the citizens.

in the matter of maintaining — SB 4.30.50-51plugin-autotooltip__small plugin-autotooltip_bigŚrīmad Bhāgavatam 4.30.39-40

After being born, Dakṣa, by the superexcellence of his bodily luster, covered all others' bodily opulence. Because he was very expert in performing fruitive activity, he was called by the name Dakṣa, meaning "the very expert." Lord Brahmā therefore engaged Dakṣa in the work of generating living entities and maintaining them. In due course of time, Dakṣa also engaged other Prajāpatis [progenitors] in the process of generation and maintenance.

for the protection of his servants — SB 9.4.48plugin-autotooltip__small plugin-autotooltip_bigŚrīmad Bhāgavatam 9.4.48

As fire in the forest immediately burns to ashes an angry snake, so, by the previous order of the Supreme Personality of Godhead, His disc, the Sudarśana cakra, immediately burnt to ashes the created demon to protect the Lord's devotee.

in giving protection to the state of Gokula — SB 10.5.19plugin-autotooltip__small plugin-autotooltip_bigŚrīmad Bhāgavatam 10.5.19

Śukadeva Gosvāmī continued: Thereafter, my dear King Parīkṣit, O best protector of the Kuru dynasty, Nanda Mahārāja appointed the local cowherd men to protect Gokula and then went to Mathurā to pay the yearly taxes to King Kaṁsa.

to protect the people strictly according to the Vedic principles of religious life — SB 5.4.5plugin-autotooltip__small plugin-autotooltip_bigŚrīmad Bhāgavatam 5.4.5

King Nābhi understood that his son, Ṛṣabhadeva, was very popular among the citizens and among government officers and ministers. Understanding the popularity of his son, Mahārāja Nābhi enthroned Him as the emperor of the world to give protection to the general populace in terms of the Vedic religious system. To do this, he entrusted Him into the hands of learned brāhmaṇas, who would guide Him in administrating the government. Then Mahārāja Nābhi and his wife, Merudevī, went to Badarikāśrama in the Himalaya Mountains, where the King engaged Himself very expertly in austerities and penances with great jubilation. In full samādhi he worshiped the Supreme Personality of Godhead, Nara-Nārāyaṇa, who is Kṛṣṇa in His plenary expansion. By doing so, in course of time Mahārāja Nābhi was elevated to the spiritual world known as Vaikuṇṭha.