Musannaf Ibn Abi Shaybah

It is narrated from Hazrat Ma'iz bin Malik Thaqafi that my respected father sent two sacrificial animals on his own behalf, on behalf of his wife, and on behalf of his daughter. They got lost when they reached the place of Dhu al-Majaz. When the day of sacrifice arrived, everyone mentioned this to Hazrat Umar. He said: Wait for today, tomorrow, and the day after tomorrow, for indeed these are the three days of sacrifice. If your animals are found, then slaughter both of them, and if they are not found, then on the third day buy two other animals in their place and slaughter them, and do not come out of Ihram until you have slaughtered them. Then, if after slaughtering the purchased sacrificial animals, the original animals are also found, then slaughter them as well.