}وَأَوْحَى رَبُّكَ إِلَى النَّحْلِ أَنِ اتَّخِذِي مِنَ الْجِبَالِ بُيُوتًا وَمِنَ الشَّجَرِ وَمِمَّا يَعْرِشُونَ (68) ثُمَّ كُلِي مِنْ كُلِّ الثَّمَرَاتِ فَاسْلُكِي سُبُلَ رَبِّكِ ذُلُلًا يَخْرُجُ مِنْ بُطُونِهَا شَرَابٌ مُخْتَلِفٌ أَلْوَانُهُ فِيهِ شِفَاءٌ لِلنَّاسِ إِنَّ فِي ذَلِكَ لَآَيَةً لِقَوْمٍ يَتَفَكَّرُون} َ
'And thy Lord taught the bee to build its cells in hills, on trees and in (men's) habitations.... there emerges from their bellies a drink, varying in colours, in which there is a healing for people. Verily in this is a Sign for those who give thought'.
[Soorah an-Nahl: 68-69]
The Messenger r said, "There is a cure in three substances, a drink of honey…" [Saheeh al-Bukhaaree (5356)].
Abu Sa'eed al-Khudri t narrated, “A man came to the Messenger r and said, ‘my brother has pain in his stomach’, so the Messenger r said, ‘give him honey to drink.’ The man came back and said, ‘O Messenger of Allah r, it only increased his illness!’ So the Messenger r said, ‘Give him honey to drink.’ The man came back and said, ‘O Messenger of Allah r, it only increased his illness!’ The Messenger of Allah r said ‘Allah spoke the truth and your brother's belly has lied. Go and give him honey to drink.’ He went and gave him honey and was cured. [Saheeh al-Bukhaaree, Book of medicine (5684), Saheeh Muslim (2217)].
Ibnul Qaiyum commented that the reason why the man wasn't cured straight after taking the honey was due to much harmful properties in the man's stomach that needed more honey for it to be removed. [Zaad al-Ma'aad -4/35].