The singer's tears are gathered by the LORD in a bottle (Psalm 56:8)

Source : Hans-Joachim Kraus (translated by Hilton C. Oswald for PSALMS 1-59 Commentary):
"Words of assurance are spoken by the psalmist in verses 8 - 11.  The petitioner knows that Yahweh has not only seen his tears but that he has carefully taken note of all his misery.  Like precious water, the tears are carefully preserved by him in a bottle (for this picture in another, compare both Job 14:17 and Hosea 13:12)."