It is narrated from Hazrat Umm Salamah (may Allah be pleased with her) that the Prophet (peace and blessings be upon him) said: Whoever assumes the Ihram for Hajj or Umrah from Bayt al-Maqdis, all his past sins will be forgiven. Based on this hadith, Umm Hakim went to Bayt al-Maqdis and assumed the Ihram for Umrah there.
Hadith Referenceمسند احمد / مسند النساء / 26558
Hadith Gradingحکم دارالسلام:إسناده ضعيف لجهالة أم حكيم، و يحيى بن أبى سفيان مستور