What is the ruling on selling a ewe that was not specified or seen at the time of sale, then specified six months later for the same price?

For a sale to be valid, the item being sold must be known to both contracting parties, either by sight or by description. Selling a ewe from a flock without specifying or describing it is invalid due to gharar (excessive uncertainty), and it leads to disputes. Therefore, the first contract is void. However, specifying the ewe and agreeing upon the old price makes the second sale valid, as what matters is the price upon which agreement is reached.