I know that Brahma hatya is the biggest sin in Hinduism.
But can anyone tell me about the biggest punya in Hinduism?
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The answer is - there is no single answer for this question.
As per different scriptures there maybe different outlook on the "biggest-puṇya".
Consider these excerpts.
As per this, the biggest punya is the recital of the 18th Chapter of Srimad Bhagvad Geeta (told by Sri Krishna to Arjuna in the Mahabharata).
Chapter 192 (Bhagavad-gītā Māhātmya),
जपत्यष्टादशाध्याये गीतानां श्लोकपंचकम् । यत्पुण्येन च संप्राप्तं तव साम्राज्यमुत्तमम् ५३। सर्वपुण्यशिरोरत्न भूतेन त्वं स्थिरो भव । इति विष्णोर्वचः श्रुत्वा ज्ञातोपायं पुरंदरः ५४।
God Vishnu said -
- 53-54. He mutters five verses from the eighteenth chapter of the Gītā. Due to that religious merit, the crown gem of all (kinds of) religious merit, he obtained your excellent sovereign empire. Be steady.
As per this, there maybe two different "biggest-puṇyas", one being the donation of food to the hungry, and other being recital of the Shiva Purāṇa.
As per the Chapter 11 of the Umā-Saṃhitā (Shiva Purāṇa 9.11), the general idea is emphasized on the superiority of the merit of food-donation to a hungry person.
On the contrary to the above, as per the Verse 9.13.31-32, and in general the Chapter 13, the general idea is given that recital of any Purāṇa, and Shiva Purāṇa specifically, is the biggest merit (Puṇya) of all.
Thus, on account of varying views on the "biggest-puṇyas" across the scriptures, we conclude that there is no "one-fits all answer" to the question posed.
Read this story by Ramakrishna Paramahamsa
There was a famous astrologer in a village who mastered the art of astrology and palmistry. One day a farmer came to see him to know about his future. The astrologer examined the lines on his palm and found out that he might die in an accident that day. He did not like to reveal this to the farmer, as that would shock him. So he told the farmer to come and see him the next day. While the farmer was on his way home, there was heavy rain with thunder and lightning. The farmer took shelter in a temple of Lord Siva. When he saw the temple in ruins, he said to himself, ‘’if I was rich I would have renovated this temple.’ Then he started imagining the renovation and reconstruction of the temple. He was mentally constructing a new temple tower and a huge corridor, with carved pillars. But he was brought out of his dreamy status by the hiss of a cobra coming out of a hole in the broken wall.
His imagination of building a temple broke to pieces and he ran out of the dilapidated temple to save his life. The next moment a massive lightning struck the temple and the huge edifice, heavy stone pillars, all collapsed.. The farmer thanked the god for saving him and next day he met the astrologer. ‘’Your palm lines indicated a danger for your life yesterday. You should have accumulated great amount of punya by constructing a temple and so you are alive today. The farmer realised the mercy of god who had granted him his life for building an imaginary temple. Every good thought is considered by god as a good deed and one gets the benefit of it.
So do you see? Not necessarily the act, but pure and good thought and mind is the greatest Punya. Actions automatically follow thought. So think good about others and do good.