Muslim 1411 records one of the most controversial hadith in the canonical Sunni corpus. The setup: Salim, the adopted son of Abu Hudhayfah ibn ʿUtba, had reached adulthood. Under Islamic law (after Q 33:4-5 abolished adoption), Salim was no longer Abu Hudhayfah's son and was thus 'unrelated' to Abu Hudhayfah's wife Sahla — meaning his presence in the household, particularly with Sahla unveiled, was now religiously problematic. Abu Hudhayfah was distressed about this.

Muhammad's solution: Sahla should breastfeed Salim. Under classical Islamic law, breastfeeding establishes a kinship bond (radhāʿa) — a child who has been breastfed by a woman becomes her 'milk son' and is permanently mahram (forbidden in marriage but permitted in close domestic interaction). The doctrine usually applies to infants. Muhammad extended it to an adult man — a 'bearded one,' as some narrations put it — to dissolve the household problem.

Sahla complied. Salim was breastfed and became Sahla's 'milk son,' resolving the religious-legal problem.

The hadith is sahih in Muslim, with extensive discussion in al-Nawawi's Sharh, in Maliki and Hanafi fiqh, and in the medieval scholarly tradition.

The theological problems:

1. The mechanics of adult breastfeeding. Establishing kinship by adult suckling requires either physical breastfeeding (an adult man suckling at a woman's breast) or extracting the milk into a vessel (which some scholars accepted as sufficient). The first form is sexually charged; the second is logistically awkward. Either way, the act is biological and intimate.

2. The divergent scholarly response. Aisha advocated extending the practice to similar situations. Other wives of Muhammad (Umm Salama, in particular) rejected the practice as exclusive to the Salim case. The Companions split: Maliki jurisprudence accepted adult breastfeeding under restrictive conditions; Hanafi and Shafiʿi rejected it. The split itself shows the ruling was contested even by the earliest community.

3. The 2007 Egyptian fatwa. In 2007, Dr. ʿIzzat ʿAtiyya, a senior cleric at Al-Azhar University, issued a fatwa permitting adult breastfeeding to allow male and female colleagues to share workplaces without violating mahram restrictions. The fatwa cited Muslim 1411. The ensuing public outrage forced its withdrawal. The episode showed both that the hadith is operative — a major scholar applied it to modern conditions — and that mainstream Muslim sentiment finds the practice deeply uncomfortable.

4. The category mismatch. Breastfeeding is biologically a parent-child interaction in infancy. Extending it to adults dissolves the natural meaning of the kinship bond. The hadith treats kinship as a legal-ritual creation rather than a biological-social reality, allowing manipulation of the kinship category to solve practical problems.

5. Sexual character. Adult breastfeeding has unmistakable sexual content. A grown man suckling at a woman's breast is, in any non-religious context, a sexual act. Religious classification of the act as 'establishing motherhood' does not change the physical character of the act. The hadith requires a religious-legal framework to override the natural meaning of the action.

6. The pattern of legal manipulation. The hadith demonstrates how classical Islamic law manages religious-legal problems through ritual workarounds. The underlying problem (an unrelated man living in a woman's household) could be solved by separation, change of arrangement, or other means. The chosen solution (adult breastfeeding) preserves the household arrangement at the cost of an awkward ritual. This is institutional creativity at the expense of moral coherence.