I heard 'Umar bin al Khattab ؓ say: l heard the Messenger of Allah ﷺ say, when he was in al'Aqeeq: ʿLast night someone came to me from my Lord and said: Pray in this blessed valley and say, 'I intend to do 'umrah with Hajj.ʿ Al-Waleed said: i.e., in Dhul-Hulaifah. (Using translation from Aḥmad 161)
"أتانى الليلة آتٍ من ربى فقال: صلِّ في هذا الوادى المبارك - يعنى العقيق - وقلْ: عمرةٌ في حجة ".