Hadith #3418 (Sunan al-Nasa'i)
Book: The Book of Divorce
Narrator(s): Abdur Rahman bin Mahdi عبد الرحمن بن مهدي, Abu Bakr bin 'Abdullah bin Abi al-Jahm أبو بكر بن عبد الله بن أبي الجهم العدوي, Sufyan bin Sa‘id Ath-Thawri سفيان الثوري

“Is she permissible for the first (husband to remarry her)?” He said: “No, not until he tastes her sweetness as the first tasted her sweetness.”

Source: https://parallelquran.com/hadith/sunan-al-nasai-3418/

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Hadith #3551 (Sunan al-Nasa'i)
Book: The Book of Divorce
Narrator(s): Abu Bakr bin 'Abdullah bin Abi al-Jahm أبو بكر بن عبد الله بن أبي الجهم العدوي, Muhammad bin Ja'far bin Abi Kathir محمد بن جعفر بن أبي كثير, Shu'bah bin al-Hajjaj شعبة بن الحجاج

“And those of you who die and leave behind wives should bequeath for their wives a year’s maintenance and residence without turning them out.” This was abrogated by the Verse on inheritance, which allocated to her one-quarter or one-eighth. And the appointed time (‘Iddah) of one year was abrogated and replaced with the (‘Iddah) term of four months and ten days.

Source: https://parallelquran.com/hadith/sunan-al-nasai-3551/