परित्राणाय साधूनां विनाशाय च दुष्कृताम् ।
धर्मसंस्थापनार्थाय सम्भवामि युगे युगे ॥
To deliver the pious and to annihilate the miscreants, as well as to reestablish the principles of religion, I Myself appear, millennium after millennium.
— Bhagavad Gita 4.8
Krishna: "Whenever and wherever there is a decline in religious practice, O descendant of Bharata, and a predominant rise of irreligion—at that time I descend Myself." - BG 4.8
Story of Putrada Ekadashi King Mahijit of Mahishmatipur was a righteous ruler but was deeply troubled by his childlessness. Seeking a solution for his sorrow, his subjects went to the forest and consulted the great sage Lomasha.
और उसके बछड़े को जल पीने से हटाकर स्वयं पानी पी लिया था, और इसी पाप के कारण वे पुत्रहीन हैं। इस पाप के प्रायश्चित के लिए मुनि ने प्रजा को 'पुत्रदा एकादशी' का व्रत करने का उपदेश दिया।
Yudhishthira asked: "O Govinda! O Vasudeva! Salutations to You! Which Ekadashi falls during the dark fortnight (Krishna Paksha) of the month of Shravana? Please describe it."
Lord Shri Krishna says: "O Yudhishthira! I have described to you the glory of Kamika Ekadashi. 'Kamika' eradicates all sins; hence, humans should definitely observe this fast. It bestows the heavenly realm and great spiritual merit.