This book by Ibn Kathir is the only book needed on stories of the Prophets. For each Prophet it goes in order from, so it brings verses from the Quran first, then Ibn Kathir explains those verses on the Prophet, going in order from the beginning of their life, to the end. Filled with verses from the Quran, the opinions of other Islamic historians, Hadith, just to get the complete story of the Prophet from an Islamic perspective.
But Ibn Kathir also gets the stories for the Prophet from biblical texts (obviously not the haram parts, which negate Islamic beliefs on Prophets, as the people of the book were quite vile and vulgar on portraying Prophets as they believed some Prophets as being alcoholics or fornicators and even worse), filling in gaps which the Islamic texts don’t mention. Remember that these parts from the people of the book aren’t hujjah, or the complete verdict, but it’s just a rough idea, satisfying the reader and making the story complete as much as possible.
But overall, this book is somewhat obligatory to read and works like it, if you want to have a better understanding of Tafsir. You cannot read tafsir in complete comprehension if you don’t know the stories of Prophets, especially Prophet Moses, as he’s mentioned the most in the Quran.