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Śrīmad-Bhāgavatam
[Canto 5, Ch. 19]
Therefore why else could He be subjected to tribulations by the kidnapping of mother Sītā?
PURPORT
When the Lord appears in this universe in the form of a human being, He has two purposes, as stated in  Bhagavad-gītā  (4.9) —  paritrāṇāya sādhūnāṁ vināśāya ca duṣkṛtām : to destroy the demons and protect the devotees. To protect the devotees, the Lord not only satisfies them by His personal presence but also teaches them so that they will not fall down from devotional service. By His personal example, Lord Rāmacandra taught the devotees that it is better not to enter married life, which is certainly followed by many tribulations. As confirmed in  Śrīmad-Bhāgavatam  (7.9.45):
yan maithunādi-gṛhamedhi-sukhaṁ hi tucchaṁ kaṇḍūyanena karayor iva duḥkha-duḥkham tṛpyanti neha kṛpaṇā bahu-duḥkha-bhājaḥ kaṇḍūtivan manasijaṁ viṣaheta-dhīraḥ
Kṛpaṇas , those who are not advanced in spiritual knowledge and who are therefore just the opposite of  brāhmaṇas , generally take to family life, which is a concession for sex. Thus they enjoy sex again and again, although that sex is followed by many tribulations. This is a warning to devotees. To teach this lesson to devotees and to human society in general, Lord Śrī Rāmacandra, although the Supreme Personality of Godhead Himself, underwent a series of tribulations because He accepted a wife, mother Sītā. Lord Rāmacandra underwent these austerities, of course, only to instruct us; actually He never has any reason to lament for anything.
Another aspect of the Lord's instructions is that one who accepts a wife must be a faithful husband and give her full protection. Human society is divided into two classes of men—those who strictly follow the religious principles and those who are devotees. By His personal example, Lord Rāmacandra wanted to instruct both of them how to fully adopt the discipline of the religious system and how to be a beloved and dutiful husband. Otherwise He had no reason to undergo apparent tribulations. One who strictly follows religious principles must not neglect to provide all