Al-Kāfi - Volume 4 > The Months in Which Al-’Umrah Is Preferable and the Case of One Who Assumes the State of Ihram in One Month and Comes Out of Such State in another Month
Hadith #3

3ـ مُحَمَّدُ بْنُ يَحْيَى عَنْ أَحْمَدَ بْنِ مُحَمَّدٍ عَنِ ابْنِ فَضَّالٍ عَنِ ابْنِ بُكَيْرٍ عَنْ عِيسَى الْفَرَّاءِ عَنْ أَبِي عَبْدِ الله (عَلَيْهِ السَّلاَم) قَالَ إِذَا أَهَلَّ بِالْعُمْرَةِ فِي رَجَبٍ وَأَحَلَّ فِي غَيْرِهِ كَانَتْ عُمْرَتُهُ لِرَجَبٍ وَإِذَا أَهَلَّ فِي غَيْرِ رَجَبٍ وَطَافَ فِي رَجَبٍ فَعُمْرَتُهُ لِرَجَبٍ.

3. Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad from ibn Faddal from ibn Bukayr from ‘Isa al-Farra’ who has said the following: “Abu ‘Abd Allah, ‘Alayhi al-Salam, has said, ‘If one says Talbiyah for al-‘Umrah in the month of Rajab and comes out of the state of Ihram in another month, his al-‘Umrah is considered as al-‘Umrah in the month of Rajab. If one says Talbiyah for al-‘Umrah in another month and comes out of the state of Ihram in the month of Rajab, his al-‘Umrah is al-‘Umrah in the month of Rajab.’”