Is there sin upon one who entered into ihram for Umrah, then revoked his ihram before entering the Grand Mosque due to exhaustion, knowing that he performed Umrah and Hajj later?

Whoever begins Hajj or 'Umrah (definition) must complete them. It is not permissible to abandon them except with a prior condition or confinement. Abandoning the state of ihram (definition) is null and void and not recognized, by the consensus of jurists. The one who abandons it remains in a state of ihram until they complete the rituals. The person who abandons ihram must remove their tailored clothes, wear the ihram garments, avoid its prohibitions, and return to complete the 'Umrah. The 'Umrahs performed after abandoning are considered completions of the first 'Umrah, and there is no sin upon them for prohibitions committed out of ignorance.