The two guarantees of Allaah تعالى:

بسم الله والحمد لله والصلاة والسلام على رسول الله ، وبعد

Allaah تعالى said:

﴿فَإِمَّا يَأْتِيَنَّكُمْ مِنِّي هُدًى فَمَنِ اتَّبَعَ هُدَايَ فَلَا يَضِلُّ وَلَا يَشْقَى * وَمَنْ أَعْرَضَ عَن ذِكْرِي فَإِنَّ لَهُ مَعِيشَةً ضَنكًا وَنَحْشُرُهُ يَوْمَ الْقِيَامَةِ أَعْمَىٰ﴾

{Then if there comes to you guidance from Me, then whoever follows My Guidance shall neither go astray, nor fall into distress and misery. But whosoever turns away from My Reminder verily, for him is a life of hardship, and We shall raise him up blind on the Day of Resurrection.} [Surah Taahaa (20): 123-124]

Ibn `Abbaas رضي الله عنهما said: “Allaah تعالى has guaranteed - to the one who RECITES the Qur’aan and ACTS upon its teachings  – that he will not go astray in this world nor will he fall into distress on the Day of Judgment” and then he recited these verses. [Majmoo` al-Fataawa (3/127)]