Read and heard that at the end of Shaykh’s Daghistani life the forehead sweat was collected. This contained knowledge from our Prophet saw & was then drunk by Shaykh Nazim, & again when Shaykh Nazim passed. Is there any Quran or hadith evidence to support this?
There are countless hadiths of Sahaba using not only the sweat of the Holy Prophet, upon him blessings and peace, such as the hadith of Umm Sulaym from Anas in Bukhari and Muslim, but also his saliva, hair, blood and other than that including food (whether meal remnants for immediate benefit or some flour to be kept for abundance), clothes and personal objects, including small money gifts (which they would also keep all their lives, never spending it) for the derivation of blessings, healing, power, etc. including knowledge, as the Prophet’s physical person and what comes from him is all purity and goodness to the Believers.
The Prophet (s) confirmed the soundness of their intentions because, as Imam Nawawi said of the hadith of the centenarian Asma’ bint Abi Bakr al-Siddiq in Sahih Muslim about using the jubbah of the Prophet to heal the sick and for other uses:
وَفِي هَذَا الْحَدِيثِ دَلِيلٌ عَلَى اسْتِحْبَابِ التَّبَرُّكِ بِآثَارِ الصَّالِحِينَ وَثِيَابِهِمْ
“In this hadith is a proof that it is recommended to seek blessings through the relics of the righteous and their clothes.”
This is the understanding of the Ummah: relics form an inheritance that benefit the entire Ummah, like the Staff of Musa being kept for generations after him for protection and victory over enemies among other Prophetic relics stowed in the Ark of the Covenant as mentioned in Surat al-Baqara. Unbelievers, however, do not accept or see or understand any of that, so they do not benefit from it and Allah increases them only in loss.
Hajj Gibril Haddad