Ibn Abbas (may Allah be pleased with them both) said that the Messenger of Allah (peace and blessings be upon him) took a ritual bath (ghusl) and put on his clothes. When he reached Dhu al-Hulayfah, he prayed two rak'ahs and mounted his camel, and when it reached al-Bayda', he entered ihram for Hajj.
Ya'qub bin Ata' is not strong.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 8945
Hadith Gradingمحدثین:حسن لغيره
Hadith Takhrij«حسن لغيره۔ حاكم 1/ 477۔ دارقطني 2/ 219»