Surah Az-Zukhruf
حَتَّىٰٓ إِذَا جَآءَنَا قَالَ يَٰلَيْتَ بَيْنِى وَبَيْنَكَ بُعْدَ ٱلْمَشْرِقَيْنِ فَبِئْسَ ٱلْقَرِينُ
“Until, when he comes to Us [at Judgement], he says [to his companion], "Oh, I wish there was between me and you the distance between the east and west - how wretched a companion."”
Translation: Saheeh International
Reflection — Ibn Kathir
The Shaytan is the Companion of the One Who turns away from Ar-Rahman
وَمَن يَعْشُ
(And whosoever Ya`shu (turns away blindly)) means, whoever willfully ignores and turns away
Reflection — Maarif ul Quran
Commentary
وَمَن يَعْشُ عَن ذِكْرِ الرَّحْمَـٰنِ (And whoever makes himself blind against the advice of the Rahman, We assign for him a devil who accompanies him all the time - 43:36) It means that whoever knowingly turns a blind eye towards Allah's advice i.e. the Holy Qur'an and wahy, Allah assigns to him a devil who accompanies him all the time in this world to prevent him from virtuous deeds, and to divert him towards evil. When such a man is resurrected in the Hereafter, his devil will also be with him, till they both are pushed in Hell. (Qurtubi).
What does this verse bring up for you today?