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.
tirmidhi:3863Maḥmūd b. Ghaylān > Azhar al-Sammān > Sulaymān al-Taymī > Khidāsh > Abū al-Zubayr > Jābir

from Jabir, that the Prophet ﷺ said: "Those who gave the pledge under the tree shall enter Paradise, except for the owner of the red camel."  

Abū ʿĪsá said that this Ḥadīth is Ḥasan-Gharīb.
الترمذي:٣٨٦٣حَدَّثَنَا مَحْمُودُ بْنُ غَيْلاَنَ قَالَ حَدَّثَنَا أَزْهَرُ السَّمَّانُ عَنْ سُلَيْمَانَ التَّيْمِيِّ عَنْ خِدَاشٍ عَنْ أَبِي الزُّبَيْرِ عَنْ جَابِرٍ

عَنِ النَّبِيِّ ﷺ قَالَ لَيَدْخُلَنَّ الْجَنَّةَ مَنْ بَايَعَ تَحْتَ الشَّجَرَةِ إِلاَّ صَاحِبَ الْجَمَلِ الأَحْمَرِ  

قَالَ أَبُو عِيسَى هَذَا حَدِيثٌ حَسَنٌ غَرِيبٌ

See similar narrations below:

Collected by Nasāʾī's Kubrá, Suyūṭī
nasai-kubra:11444Qutaybah b. Saʿīd > al-Layth > Abū al-Zubayr > Jābir

No one of those who took the oath of allegiance under the tree will go to hell. (Using translation from Abū Dāʾūd 4653)   

الكبرى للنسائي:١١٤٤٤أَخْبَرَنَا قُتَيْبَةُ بْنُ سَعِيدٍ حَدَّثَنَا اللَّيْثُ عَنْ أَبِي الزُّبَيْرِ عَنْ جَابِرٍ

عَنْ رَسُولِ اللهِ ﷺ قَالَ «لَا يَدْخُلُ النَّارَ أَحَدٌ بَايَعَ تَحْتَ الشَّجَرَةِ»