(Zumar) 39 : 37
وَمَنْ يَهْدِ اللَّهُ فَمَا لَهُ مِنْ مُضِلٍّ ۗ أَلَيْسَ اللَّهُ بِعَزِيزٍ ذِي انْتِقَامٍ
And the one whom Allah guides, then none is there to stray him; isn’t Allah the Exalted, the Revenging.
That means whoever holds to Adhikr—the unbreakable Rope from Allah—none can lead him astray. See explanation 7: 178; 10: 108; 32: 22.