Mk 1:15 – Mark introduces the public ministry of Jesus with his proclamation that, “The time is fulfilled, and the kingdom of God is at hand; repent and believe the gospel”.
Mk 4 relates the teaching of Jesus in which the mystery of the kingdom is explained to his disicples, but conveyed to others in dark parables, Mk 4:11. The kingdom is likened to seed which is sown, shoots up, and grows quietly, Mk 4:26. Mk 4:30 stresses the contrast between the insignificant beginning and the immense growth of the kingdom of God.
In Mk 9:1 the kingdom of God is imminent, to be expected within a generation or two. In Mk 9:47 the importance of entering the kingdom – even at the cost of losing one’s eye – is stressed.
According to Mk 10:14 children should be allowed to come to Jesus because the kingdom of God belongs to such as these, and to those who have a childlike faith, Mk 10:15.
In Mk 10:23-25, love of possession is reckoned to be a hindrance to entering the kingdom of God. Sacrifice of everything is demanded.
Mk 12:34 – The scribe perceived that devotion to God lay at the heart of religion and was told in response that he was not far from the kingdom of God.
In Mk 14:25 the kingdom of God is referred to in the context of an eschatological feat.
In Mk 15:43 Joseph of Arimathea is described as one who was awaiting the kingdom of God.
See Dictionary of Jesus and the Gospels, art. ‘Kingdom of God’