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:2-422b
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السيوطي:٢-٤٢٢b

"عَنْ عُمَرَ فِي قَوْلِهِ تَعَالَى: {الْحَجُّ أَشْهُرٌ مَعْلُومَاتٌ} قَالَ: شَوَّالُ وَذُو القَعْدَةِ وَذُو الْحَجَّةِ".  

[ص] سعيد بن منصور وابن المنذر، [ق] البيهقى في السنن

See similar narrations below:

Collected by Suyūṭī