What does Mark 5:30 mean?Bible scholars have debated for generations as to how much Jesus "knew" during His time on earth. Did He, being fully God, always have the omniscience of God (Mark 2:8)? Or, as fully man, was He only aware of what His senses determined and what the Holy Spirit inspired Him to know? If Jesus' knowledge is limited, the question He poses to the crowd is self-explanatory. However, even if He already knows, this is consistent with God's use of questions throughout Scripture.
In Genesis 3:9, while Adam and Eve are hiding from their sin of eating the fruit of the tree of knowledge, God calls out, "Where are you?" The question isn't meant to gather information that God doesn't already have. It is meant to direct the conversation, to allow Adam and Eve to present themselves to God and have an honest discussion. God repeats this strategy with Cain when He asks, "Where is Abel your brother?" (Genesis 4:9). Parents deliberately use such tactics all the time to attempt to draw an honorable truth from their children.
So, whether Jesus knows the woman has touched Him or not, the question has the desired effect. The crowd stops, perhaps even pulling back to give them space. It's unclear if others in the crowd have received healing as in Matthew 14:34–36 and Luke 6:17–19. It is clear that Jesus feels the need to address this woman specifically.
Although the Bible is hazy regarding Jesus' source of knowledge, the Gospels do seem to indicate that His miraculous healing power comes from the Holy Spirit. Luke 4:14 says that Jesus started His ministry "in the power of the Spirit," and the Spirit authorizes His ministry (Luke 4:18). Matthew 12:28 seems to indicate that Jesus' power to expel demons comes from the Holy Spirit, although He may mean His work is in accordance with the will of the Holy Spirit.
Even so, when we read that Jesus feels power coming out of Him, we need not infer that His power is limited. This incident is more like noticing that water is flowing from a fire hydrant, or a massive lake. The power is moving out of Jesus, but it is not being reduced in Jesus.