Nikkah halala to get back with first husband halal haram makrooh does it invalidate the nikkah when she marries the first husband agian
All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad is His slave and Messenger.
It is permissible for a woman to marry her first husband if there are no legal (Sharee'ah) impediments, such as being married to another husband, or being in her Iddah (waiting period) from this other husband, or her first husband has divorced her three times, and she did not marry another man with her desire and consummated the marriage and then divorced her, or other such impediments.
If the woman is free of these impediments, and the marriage was conducted after meeting all the conditions of a valid marriage, of which the most important is the guardian and witnesses, then the marriage is valid.
If this question is related to a specific case, we advise you to verbally contact one of your scholars to clarify the matter and give him more details so that he can deliver the fatwa according to the actual situation.
Allah knows best.
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