In 57:24, there is a missing/added word in different Qiraats of the Quran as it says here.
But in Surah Baqarah, why are there 286 verses in Hafs version and 285 verses in Warsh version?
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That is a difference of how the verses are counted, not that there is a whole new sentence in one qira'a.
Specifically speaking, we normally consider (in Hafs 'an Aasim) الم to be the first verse of Surah Baqarah and ذَلِكَ الْكِتَابُ لَا رَيْبَ فِيهِ هُدًى لِلْمُتَّقِينَ to be the second. Warsh 'an Nafi (and some others), however, consider(s) these both to be one verse.
So, this is the first verse of Surah Baqarah to Warsh:
الم ذَلِكَ الْكِتَابُ لَا رَيْبَ فِيهِ هُدًى لِلْمُتَّقِينَ
while these are two verses to Hafs.