God using an audible voice to communicate

Scripture references

Acts 10:13–15 (ASV 1901)

13And there came a voice to him, Rise, Peter; kill and eat. 14But Peter said, Not so, Lord; for I have never eaten anything that is common and unclean. 15And a voice came unto him again the second time, What God hath cleansed, make not thou common.

Acts 11:7–9 (ASV 1901)

7And I heard also a voice saying unto me, Rise, Peter; kill and eat. 8But I said, Not so, Lord: for nothing common or unclean hath ever entered into my mouth. 9But a voice answered the second time out of heaven, What God hath cleansed, make not thou common.

Stories

Arlene Peters, with her husband Dave, was a very content missionary in Bogota, Columbia. But God had told her husband that He was calling them to Brazil. Arlene did not agree...until she heard God's voice clearly.
In a dream, God revealed to Mathilda Wrede that she was to work in prison ministry. She was uncertain that the dream really meant that for her, so the next morning He spoke to her audibly while we walked up and down the beach. Mathilda Wrede devoted her life to prison ministry.
Lolita's faith was strengthened when she listened to the voice of the Lord and safely made it out of a burning building.
At several times, an Islamic background man hears the voice of Jesus saying, "I am the Way, the Truth, and the Life". Eventually, he yields and becomes a Christian.
Locked away in solitary confinement and nearing the point of "madness and despair", Harlan Popov hears clearly, the comforting and assuring words of Jesus.
Harlan Popov hears God's voice and experiences the assurance of His presence while in captivity.
God saved Vanya and a sergeant's lives by causing a minor delay while they were traveling. They discovered several moments later that there's been a grisly accident with casualties; they would have died if not for the delay.