The ruling on the one in i'tikaf (spiritual retreat in the mosque) leaving on the day of the festival

Question:
Regarding the one in i'tikaf in the mosque, is it better for him to leave on the day of the festival to obtain the reward, or if he hears that it is the night of the festival?

Answer:
The best is if he wishes to stay, he does not leave for the festival and leaves on the day of the festival, and if he wishes to leave when the sun sets on the last day. The matter is broad; there is nothing clear in the Sunnah. A sound chain that the Prophet (peace and blessings be upon him) delayed his exit from i'tikaf is not established. It is narrated that the Prophet (peace and blessings be upon him) used to leave from i'tikaf to the place of prayer, but it needs a sound chain.