From Sahih Bukhari (Hadith 1558):
Narrated Anas bin Malik:`Ali came to the Prophet (ﷺ) from Yemen (to Mecca). The Prophet (ﷺ) asked `Ali, "With what intention have you assumed Ihram?" `Ali replied, "I have assumed Ihram with the same intention as that of the Prophet." The Prophet (ﷺ) said, "If I had not the Hadi with me I would have finished the Ihram." Muhammad bin Bakr narrated extra from Ibn Juraij, "The Prophet (ﷺ) said to `Ali, "With what intention have you assumed the Ihram, O `Ali?" He replied, "With the same (intention) as that of the Prophet." The Prophet (ﷺ) said, "Have a Hadi and keep your Ihram as it is
Reference: Bukhari 1558