Saliva or spittle in a dream represents the element of one’s strength.
If in a dream one seems to have a dry mouth, it represent his inability to do what his competition can do. Spitting against a wall in a dream means spending one’s money in a good cause, or engaging in a profitable business. Spitting on the floor in a dream means purchasing land. Spitting against a tree in a dream means to recant one’s promise. Spitting at another person in a dream means despising him. Warm saliva in a dream means long life, while cold saliva represents a short life.
The color of one’s saliva in a dream shows the state of one’s spirit. Spiting blood or phlegm in a dream means speaking ill of others.... Islamic Dream Interpretation
1- Normally in dreams spittle will represent disgust. We would, in former times, ‘spit venom’, which is a very basic image as to how a hurt or threatened animal will react.
2- More positively, spittle can indicate a sign of good faith. Some cultures still spit on their hands when completing a deal. There is a bonding through the exchange of bodily fluids.
3- Since Biblical times, spittle has been seen as a healing fluid. It was supposed to be an antidote against being cursed, particularly by the use of the Evil Eye. Spiritually it is perhaps symbolic of the flow of energy between healer and patient.... Ten Thousand Dream Dictionary