Hadith: ‘Umrah in Ramadan is equivalent to Hajj – or Hajj with me.

عَنِ ابْنِ عَبَّاسٍ رضي الله عنهما قَالَ:

قَالَ رَسُولُ اللهِ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ لِامْرَأَةٍ مِنَ الْأَنْصَارِ سَمَّاهَا ابْنُ عَبَّاسٍ فَنَسِيتُ اسْمَهَا: «مَا مَنَعَكِ أَنْ تَحُجِّي مَعَنَا؟» قَالَتْ: لَمْ يَكُنْ لَنَا إِلَّا نَاضِحَانِ فَحَجَّ أَبُو وَلَدِهَا وَابْنُهَا عَلَى نَاضِحٍ وَتَرَكَ لَنَا نَاضِحًا نَنْضِحُ عَلَيْهِ، قَالَ: «فَإِذَا جَاءَ رَمَضَانُ فَاعْتَمِرِي، فَإِنَّ عُمْرَةً فِيهِ تَعْدِلُ حَجَّةً».
[صحيح] - [متفق عليه]

‘Abdullāh ibn ‘Abbās (may Allah be pleased with him) reported that the Prophet (may Allah's peace and blessings be upon him) said: "‘Umrah in Ramadan is equivalent to Hajj – or Hajj with me."
Sahih/Authentic. - [Al-Bukhari and Muslim]

Explanation

Performing ‘Umrah in the month of Ramadan merits a reward equal to that of performing a voluntary Hajj or performing Hajj in the company of the Prophet (may Allah’s peace and blessings be upon him).