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.
quran:9:37

Indeed, the postponing ˹of restriction within sacred months˺ is an increase in disbelief by which those who have disbelieved are led ˹further˺ astray. They make it lawful one year and unlawful another year to correspond to the number made unlawful by Allah and ˹thus˺ make lawful what Allah has made unlawful. Made pleasing to them is the evil of their deeds; and Allah does not guide the disbelieving people.  

Postponement ˹of the sacred month˺ — that is, the deferment of the sacredness of a given month to another, as they used to do during paganism, such as postponing the sacredness of Muharram, if it arrives while they are at war, to Safar — is only an excess of unbelief, because of their rejection of God’s ruling thereof, whereby those who disbelieve are led astray (yudallu may also be read yadillu, ‘˹they˺ go astray’), one year they make it, the month postponed, profane, and hallow it another, that they may make up, by profaning one month and hallowing another in its place, the number, of months, which God has hallowed, such that they do not hallow more, or less, than the four months, but without observing the individual months themselves; and so they profane what God has hallowed. Their evil deeds have been adorned for them, such that they deem them to be good ˹deeds˺; and God does not guide the disbelieving folk.
القرآن:٩:٣٧

إِنَّمَا النَّسِيءُ زِيَادَةٌ فِي الْكُفْرِ ۖ يُضَلُّ بِهِ الَّذِينَ كَفَرُوا يُحِلُّونَهُ عَامًا وَيُحَرِّمُونَهُ عَامًا لِيُوَاطِئُوا عِدَّةَ مَا حَرَّمَ اللَّهُ فَيُحِلُّوا مَا حَرَّمَ اللَّهُ ۚ زُيِّنَ لَهُمْ سُوءُ أَعْمَالِهِمْ ۗ وَاللَّهُ لَا يَهْدِي الْقَوْمَ الْكَافِرِينَ  

{إنما النسيء} أي التأخير لحرمة شهر إلى آخر كما كانت الجاهلية تفعله من تأخير حرمة المحرم إذا هلَّ وهم في القتال إلى صفر {زيادة في الكفر} لكفرهم بحكم الله فيه {يُضَلٌ} بضم الياء وفتحها {به الذين كفروا يحلونه} أي النسيء {عاما ويحرمونه عاما ليواطئوا} يوافقوا بتحليل شهر وتحريم آخر بدله {عدة} عدد {ما حرم الله} من الأشهر فلا يزيدوا على تحريم أربعة ولا ينقصوا ولا ينظروا إلى أعيانها {فيحلوا ما حرم الله زُيِّن لهم سوء أعمالهم} فظنوه حسنا {والله لا يهدي القوم الكافرين}.