Today in Hindu society, unmarried girls are still taught to worship Lord Śiva with the idea that they may get husbands like him. Lord Śiva is the ideal husband, not in the sense of riches or sense gratification, but because he is the greatest of all devotees. Vaiṣṇavānāṁ yathā śambhuḥ: Śambhu, or Lord Śiva, is the ideal Vaiṣṇava. He constantly meditates upon Lord Rāma and chants Hare Rāma, Hare Rāma, Rāma Rāma, Hare Hare. Lord Śiva has a Vaiṣṇava sampradāya, which is called the Viṣṇu Svāmī-sampradāya. Unmarried girls worship Lord Śiva so that they can expect a husband who is as good a Vaiṣṇava as he. The girls are not taught to select a husband who is very rich or very opulent for material sense gratification; rather, if a girl is fortunate enough to get a husband as good as Lord Śiva in devotional service, then her life becomes perfect. The wife is dependent on the husband, and if the husband is a Vaiṣṇava, then naturally she shares the devotional service of the husband because she renders him service. This reciprocation of service and love between husband and wife is the ideal of a householder's life.
(Srimad Bhagavatam------3:23:1------purport).

Lord Śiva is known as the greatest devotee of the Supreme Personality of Godhead. He is known as the best of all types of Vaiṣṇavas (vaiṣṇavānāṁ yathā śambhuḥ). Consequently, Lord Śiva has a Vaiṣṇava sampradāya, the disciplic succession known as the Rudra-sampradāya. Just as there is a Brahma-sampradāya coming directly from Lord Brahmā, the Rudra-sampradāya comes directly from Lord Śiva. Lord Śiva is one of the twelve great personalities, as stated in Śrīmad-Bhāgavatam (6.3.20):
svayambhūr nāradaḥ śambhuḥ
kumāraḥ kapilo manuḥ
prahlādo janako bhīṣmo
balir vaiyāsakir vayam
These are twelve great authorities in preaching God consciousness. The name Śambhu means Lord Śiva. His disciplic succession is also known as the Viṣṇu Svāmī-sampradāya, and the current Viṣṇu Svāmī-sampradāya is also known as the Vallabha-sampradāya. The current Brahma-sampradāya is known as the Madhva-Gauḍīya-sampradāya.
(Srimad Bhagavatam------4:24:18------purport).

It is especially significant that Lord Śiva is a pure devotee of Lord Vāsudeva. Vaiṣṇavānāṁ yathā śambhuḥ: "Amongst all Vaiṣṇavas, Lord Śiva is the topmost." Consequently Lord Śiva has a sampradāya, a Vaiṣṇava disciplic succession, called the Rudra-sampradāya. At the present moment those who belong to the Viṣṇu Svāmī-sampradāya of Vaiṣṇavas come from Rudra, Lord Śiva. To become a devotee of Lord Kṛṣṇa, Vāsudeva, is very, very difficult. The word especially used in this connection is durārādhyam. The worship of the demigods is not very difficult, but becoming a devotee of Lord Vāsudeva, Kṛṣṇa, is not so easy. However, if one adheres to the principles and follows in the footsteps of the higher authorities, as advised by Lord Śiva, one can easily become a devotee of Lord Vāsudeva.
(Srimad Bhagavatam------4:24:76------purport).

The word bhokṣyate is very important in this verse. Just as a king gives protection to his citizens, these devotees, following the principles of devotional service, will give protection to all the people of the world. The people of the world are very much harassed by so-called religious-principled svāmīs, yogīs, karmīs and jñānīs, but none of these can show the right way to become elevated to the spiritual platform. There are primarily four parties spreading devotional service all over the universe. These are the Rāmānuja-sampradāya, the Madhva-sampradāya, the Viṣṇu Svāmī-sampradāya and the Nimbārka-sampradāya. The Madhva-Gauḍīya-sampradāya in particular comes from Lord Caitanya Mahāprabhu. All these devotees are spreading this Kṛṣṇa consciousness movement very widely and giving protection to innocent people who are being so much embarrassed by pseudo-avatāras, -svāmīs, -yogīs and others.
(Srimad Bhagavatam------4:28:31------purport).