Hadith: certainly admit him into Paradise, regardless of the deeds which he has done

عَنْ عُبَادَةَ رَضِيَ اللَّهُ عَنْهُ عَنِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ:
«مَنْ شَهِدَ أَنْ لَا إِلَهَ إِلَّا اللهُ وَحْدَهُ لَا شَرِيكَ لَهُ، وَأَنَّ مُحَمَّدًا عَبْدُهُ وَرَسُولُهُ، وَأَنَّ عِيسَى عَبْدُ اللهِ وَرَسُولُهُ وَكَلِمَتُهُ أَلْقَاهَا إِلَى مَرْيَمَ وَرُوحٌ مِنْهُ، وَالْجَنَّةُ حَقٌّ، وَالنَّارُ حَقٌّ، أَدْخَلَهُ اللهُ الْجَنَّةَ عَلَى مَا كَانَ مِنَ الْعَمَلِ».
[صحيح] - [متفق عليه] - [صحيح البخاري: 3435]

‘Ubādah (may Allah be pleased with him) reported that the Prophet (may Allah's peace and blessings be upon him) said:
"Whoever bears witness that there is no god but Allah alone with no partner and that Muhammad is His slave and Messenger; that ‘Isa (Jesus) is the slave and Messenger of Allah, and His word which He communicated to Maryam (Mary), and a spirit from Him; and that Paradise is true and Hellfire is true, Allah will certainly admit him into Paradise, regardless of the deeds which he has done."
[Authentic hadith] - [Narrated by Bukhari & Muslim] - [Sahih Bukhari - 3435]

Explanation

The Messenger of Allah (may Allah's peace and blessings be upon him) informs us that whoever utters the word of Tawhīd (monotheism), knows its meaning and acts accordingly, and bears witness that Muhammad (may Allah's peace and blessings be upon him) is the slave and Messenger of Allah, acknowledges the fact that Jesus is a slave of Allah and a messenger from Him, whom Allah created by saying: "Be" and he was, and that he was one of the souls created by Allah, and declares his mother (Mary) innocent of the Jews' accusations, and believes that Paradise is true and Hellfire is true while believing in their existence and in their being bliss and punishment from Allah, and dies in this state, he will be admitted to Paradise even if he has been negligent in performing acts of obedience and has committed sins.