The Twenty-Ninth Category
Recognising the Higher and the Lower Isnād

The isnād is a distinctive hallmark of this Ummah, a firmly established sunnah, and seeking elevation (ʿulū) within it is itself a sunnah; for that very reason the scholars deemed it commendable to journey in pursuit of ḥadīth. Elevation is of several kinds, the most excellent of which is to draw as near as possible to the Messenger of Allah ﷺ through a sound, unblemished chain of transmission.

2. The next degree is nearness to one of the Imams of ḥadīth, even though the number of links between him and the Messenger of Allah ﷺ may be many.

3. A third form of elevation is measured against one of the Five Books or other authoritative compilations. This is the area on which later scholars have lavished attention, discussing four matters: muwāfaqa (concordance), ibdāl (substitution), musāwāh (equivalence), and muṣāfaḥa (handshake).

• Muwāfaqa occurs when a ḥadīth reaches you from a shaykh of Muslim by some route other than his, and with fewer intermediaries than you would have if you narrated it from Muslim himself through that same shaykh.

• Ibdāl is when such elevation is attained through someone of the same rank as a shaykh of Muslim; this may also be called muwāfaqa in relation to a shaykh of Muslim’s shaykh.

• Musāwāh, in our time, is that the number of narrators between you and a Companion—or someone of similar rank—is the same as that which lies between Muslim and that Companion.

• Muṣāfaḥa is achieved when that musāwāh pertains to your own shaykh. It is as though you had shaken hands with Muslim himself and taken the ḥadīth directly from him. If the musāwāh is with the shaykh of your shaykh, then the muṣāfaḥa is reckoned for your shaykh, and if it is—