8 Dhu al-Hijjah: Tarwiyah — departure to and stay in Mina.
9 Dhu al-Hijjah: Arafah — the prescribed standing at Arafat.
The two names refer to distinct days and actions. Staying in Mina on the eighth is not a substitute for the standing at Arafat on the ninth.
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Book of Hajj: Sa’y between Safa and Marwa and the Day of Tarwiyah
8 Dhu al-Hijjah: Tarwiyah — departure to and stay in Mina.
9 Dhu al-Hijjah: Arafah — the prescribed standing at Arafat.
The two names refer to distinct days and actions. Staying in Mina on the eighth is not a substitute for the standing at Arafat on the ninth.