The Messenger of Allah ﷺ said, "Saddle this camel, then have your sister ride behind you. When you both descend from the hill of Tan'eem, enter the state of ihram and proceed." That was on the night of departure.
حدثنا علي بن إسحاق أنبأنا عبد الله يعني ابن المبارك أنبأنا زكريا بن إسحاق عن ابن أبي نجيح أن أباه حدثه أنه أخبره من سمع
قال رسول الله ﷺ ارحل هذه الناقة ثم أردف أختك فإذا هبطتما من أكمة التنعيم فأهلا وأقبلا وذلك ليلة الصدر
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Its chain of transmission is daif, because of the anonymity of the man who heard from Abdul-Rahman bin Abu Bakr. Its meaning has already appeared with a sahih chain at 1705, and it will come again at 1710. Zakariya bin Ishaq the Makkan is trustworthy, though he has been criticized concerning the matter of predestination, and the authors of the six books have narrated from him. Ibn Abu Najeeh is Abdullah bin Yasar."Unsaddle this camel" means remove the saddle from it. It is an imperative verb from the trilateral root, as one says, "the camel was unsaddled, he unsaddles it, an unsaddling," meaning the saddle was placed upon it. In the manuscript marked K it is vowelled with a fatha on the hamza, as if from the quadrilateral form, but there is no basis for that."The day of departure," with fatha on the sad and the dal, is the fourth day of the days of sacrifice, because it is the day on which people depart from Makkah to their homes.