John Wesley on Leviticus 5:11

The tenth part of an ephah - About six pints. He shall put no oil, neither frankincense - Either to distinguish these from the meal - offerings, Lev 2:1, or as a fit expression of their sorrow for their sins, in the sense whereof they were to abstain from things pleasant; or to signify that by his sins he deserved to be utterly deprived both of the oil of gladness, the gifts, graces and comforts of the Holy Ghost; and of God's gracious acceptance of his prayers and sacrifices, which is signified by incense, Psa 141:2.