What does the Bible say about signs and miracles?

In Exodus 4, God provides Moses with several signs to validate the message he brought to the elders of Israel. These signs include a rod turning into a serpent and Moses' hand becoming leprous and then restored. Such miracles served to prove that God had indeed spoken to Moses and to encourage belief among the people. However, it's important to note that signs are not always necessary for faith; rather, genuine belief is ultimately a gift from God, given by the Holy Spirit. Today, while we do not see the same miraculous signs, we have the scriptures and the message of the gospel, which serve as the ultimate foundation for our faith.