Sunan an-Nasa'i - Book 27, Hadith 170
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It was narrated from Ibn 'Umar that he divorced his wife when she was menstruating. 'Umar, may Allah be pleased with him, mentioned that to the Prophet and he said: "Tell him to take her back until she menstruates again, then when she becomes pure, if he wants he may divorce her and if he wants he may keep her. This is the divorce that Allah has enjoined. Allah, the Mighty and Sublime, says: 'The divorce is twice, after that, either you retain her on reasonable terms or release her with kindness.'"
How the Prophet ص modelled 2 behaviours here
Gentleness & Kind Speech
“or release her with kindness”
Is gentle and soft toward his wife in word and deed; speaks kindly and never with harshness, insult, or contempt.
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This hadith also models: Justice & Fairness
Justice & Fairness
“either you retain her on reasonable terms”
Treats his wife (and co-wives) justly and equitably; honors her rights and gives her what is due without wronging her.
This hadith also models: Gentleness & Kind Speech