Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
suyuti:2-340bKharashah b. al-Ḥur

[Machine] I saw Umar ibn al-Khattab striking the palms of men's hands during the month of Rajab until they were placed in their food, and he would say: Rajab, what is Rajab?! Rajab is just a month that the people of ignorance used to glorify, but when Islam came, it was abandoned.  

السيوطي:٢-٣٤٠bعَنْ خَرَشَةَ بنِ الْحُرِّ

"عَنْ خَرَشَةَ بنِ الْحُرِّ قال: رأيتُ عمَر بن الخطابِ يضربُ أَكُفَّ الرجالِ في صومِ رجبٍ حتى يَضَعُوهَا فِى الطعامِ، ويقول: رجَبٌ وما رجبٌ؟ ! إنما رجبٌ شهرٌ كانتْ تعظِّمهُ أهلُ الجاهلية، فلما جاءَ الإسلامُ تُرِكَ".  

[ش] ابن أبى شيبة [طس] الطبرانى في الأوسط