Is it permissible to slaughter sacrificial animals on the 11th of Dhul-Hijjah instead of the 10th of Dhul-Hijjah?

If it is confirmed that the month of Dhu al-Hijjah is delayed for them, then their Eid celebration on the delayed day is correct. However, if they are like others in the confirmation of the month, and they delayed the sacrifice until the first day of Ayyam al-Tashreeq, then their sacrifice is valid and sufficient, and they will be rewarded for it. This is because the time for sacrifice extends to the last day of Ayyam al-Tashreeq, according to the preponderant opinion, or for two days after the day of Nahr, according to others. The evidence for this is the hadith: "All of Ayyam al-Tashreeq are for sacrifice." The opinion that the time for sacrifice is restricted only to the day of Nahr is that of Muhammad ibn Sireen, and it contradicts the opinion of the majority.