Fiqh-us-Sunnah Volume 5, Hajj and ‘Umrah, Fiqh 5.094.

After the sunrise of the 9th day of Zhul-Hijjah, it is sunnah to leave for Arafah by way of Zhabb while uttering takbir (Allahu Akbar), tahlil (La ilaha il-lal-lah), and talbiyah (Labaika Allahumma lab-baik).

Mohammed bin Abi Bakr Al-Thaqafi said: “I asked Anas bin Malik regarding talbiyah, while we were on our way to Arafah from Mina, ‘How did you do it while you were with the Prophet (peace be upon him)?’ Anas answered, ‘Some (of us) said talbiyah, while others said takbir, and yet others repeated La ilaha il-lal-lah. And the Prophet (peace be upon him) did not disapprove of any of them.”‘ This is reported by Bukhari and others.

It is desirable to stop at Namira and take an ablution or bath in preparation for one’s stay at Arafah. Furthermore, it is liked that one should enter Arafah at the time appointed for staying there which is after midday.