It is narrated from Sayyiduna Umar (may Allah be pleased with him), he used to say that when a husband makes his wife unlawful for himself, this is an oath, for which he will give expiation. And Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) also used to say that making the wife unlawful for oneself is an oath, for which he will give expiation. Furthermore, Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) recited this verse: {لَقَدْ کَانَ لَکُمْ فِیْ رَسُوْلِ اللّٰہِ اُسْوَۃٌ حَسَنَۃٌ} … In the life of the Messenger of Allah (peace and blessings be upon him), there is the best example for you.