The ruling on whoever spends the Night outside of Mina due to Ignorance
Question :
Verily, I performed Hajj along with my family this year. We spent the night for three days and due to the numerous Hajj pilgrims we found out after two days had passed that we were outside of Mina. Therefore, I hope for a beneficial answer concerning what is the consequence of that?
Answer:
If you could not find a place there is no sin on you. If you found a place but you were lax about spending the night there (in Mina), then you must repent to Allâh. If you did not spend all of the required nights (in Mina), the people of knowledge say that you must offer a ransom (of atonement, i.e., slaughter an animal) that is to be distributed among the poor people of Makkah. If you did not spend the first night, but you spent the second night, you must feed a poor person.
Source:
Ash-Shaykh Ibn 'Uthaimin
Fatawa Islamiyah, Vol. 4 Pages 229-230