Hadithcore
Riyad as-Salihin, 591

'Uqbah bin Al-Harith (May Allah be pleased with him) reported that he had married a daughter of Abu Ihab bin 'Aziz and a woman came to him and said she had suckled both 'Uqbah and the woman whom he had married, to which he replied:

"I am not aware that you suckled me, and you did not inform me." So he ('Uqbah) rode to Messenger of Allah (ﷺ) in Al-Madinah and put the matter before him. The Messenger of Allah (ﷺ) said, "How can you continue (to be her husband) after what you have been told?" 'Uqbah (May Allah be pleased with him) therefore divorced her and she married another man. <b>[Al- Bukhari]</b>.

وعن أبي سروعة -كسر السين المهملة ونصبها- عقبة بن الحارث رضي الله عنه أنه تزوج ابنة لأبي إهاب بن عزيز، فأتته امرأة فقالت‏:‏ إنى قد أرضعت عقبة والتى قد تزوج بها، فقال لها عقبة‏:‏ ما أعلم أنك أرضعتني ولا أخبرتني فركب إلى رسول الله صلى الله عليه وسلم بالمدينة فسأله فقال رسول الله صلى الله عليه وسلم‏:‏ “كيف، وقد قيل‏؟‏‏!‏” ففارقها عقبة ونكحت زوجاً غيره”‏.‏ ‏(‏‏(‏رواه البخاري‏)‏‏)‏‏.‏

References1 variant
In-Book Reference
Introduction, Hadith 591
Sharh · explanationclick to expand
<b>Guidance from the Hadith:</b><br> 1) A woman’s testimony that she has suckled a person is sufficient proof to confirm it.<br> 2) A person who is unaware or uncertain about some ruling is required to refer to the scholars.<br> 3) A person should be cautious to preserve his religion. The Prophet (may Allah’s peace and blessings be upon him) said: “The best of your religion is piety.” [Narrated by Al-Hākim]<br> <br> <b>Benefit:</b><br> Suckling that causes non-marriageability is that which meets the following conditions:<br> 1) The milk comes from a woman; Allah Almighty said: {And your [milk] mothers who nursed you}<br> 2) There were five full (satiating) sucklings or more.<br> 3) The suckling takes place within the first two years before weaning.<br> If non-marriageability is established, it applies to the suckled person and his progeny only, i.e. his descendants. As for his ascendants and collaterals, like his parents and siblings, it has no effect on them.<br> For example, the father of the suckled child, his brother, and his sister are not affected by this suckling.