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.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
suyuti:735a –

'Umar bin Khattab addressed us at Jabiyah and said: “The Messenger of Allah ﷺ stood up among us as I stand among you, and said: 'Honor my Companions for my sake, then those who come after them, then those who come after them. Then lying will prevail until a man will give testimony without being asked to do so, and he will swear an oath without being asked to do so.' ” (Using translation from Ibn Mājah 2363)   

السيوطي:٧٣٥a –

"احفظونى في أصحابى، ثم الذين يلونهم، ثم الذين يلونهم، ثم يفشو الكذب، حتى يشهدَ الرجل وما يُسْتَشْهدُ، ويَحْلِف وما يُستحلف.  

[هـ] ابن ماجة عن عمر

See similar narrations below:

Collected by Ibn Mājah
ibnmajah:2363 – ʿAbdullāh b. al-Jarrāḥ > Jarīr > ʿAbd al-Malik b. ʿUmayr > Jābir b. Samurah > Khaṭabanā ʿUmar b. al-Khaṭṭāb Bi-al-Jābiyah

'Umar bin Khattab addressed us at Jabiyah and said: “The Messenger of Allah ﷺ stood up among us as I stand among you, and said: 'Honor my Companions for my sake, then those who come after them, then those who come after them. Then lying will prevail until a man will give testimony without being asked to do so, and he will swear an oath without being asked to do so.' ”  

ابن ماجة:٢٣٦٣ – حَدَّثَنَا عَبْدُ اللَّهِ بْنُ الْجَرَّاحِ حَدَّثَنَا جَرِيرٌ عَنْ عَبْدِ الْمَلِكِ بْنِ عُمَيْرٍ عَنْ جَابِرِ بْنِ سَمُرَةَ قَالَ خَطَبَنَا عُمَرُ بْنُ الْخَطَّابِ بِالْجَابِيَةِ فَقَالَ

إِنَّ رَسُولَ اللَّهِ ﷺ قَامَ فِينَا مِثْلَ مُقَامِي فِيكُمْ فَقَالَ احْفَظُونِي فِي أَصْحَابِي ثُمَّ الَّذِينَ يَلُونَهُمْ ثُمَّ الَّذِينَ يَلُونَهُمْ ثُمَّ يَفْشُو الْكَذِبُ حَتَّى يَشْهَدَ الرَّجُلُ وَمَا يُسْتَشْهَدُ وَيَحْلِفَ وَمَا يُسْتَحْلَفُ