1 Tim 6:15-16 says “he (God) who is the blessed and only Sovereign, the King of kings and Lord of lords, 16 who alone has immortality.” This raises an intriguing question. If God “alone has immortality” how do we reconcile this with the truth that the soul is immortal? This does not mean that none of His creatures are immortal in any sense of the word. Louis Markos elaborates quoting Louis Berkhof,

Understood in that unrestricted sense, this word of Paul would also teach that the angels are not immortal, and this is certainly not the intention of the apostle. The evident meaning of his statement is that God is the only being who possesses immortality ‘as an original, eternal, and necessary endowment.’ Whatever immortality may be ascribed to some of His creatures, is contingent on the divine will, is conferred upon them, and therefore had a beginning. God, on the other hand, is necessarily free from all temporal limitations.” Louis Berkhof, “Immortality of the Soul,” Monergism, https://www.monergism.com/immortality-soul.