Genesis 8:8

וישלח את היונה AND HE SENT FORTH A DOVE at the end of seven days, for it is written, (Genesis 8:10) “And he stayed yet other seven days” — from this statement you may infer that after the first occasion, also, he waited seven days. וישלח And HE SENT FORTH — This does not mean merely “sending on an errand”, but “sending away”, “letting go” — he freed her to go where she liked, and thus he could see whether the waters abated, because if she could find a resting place she would not return to him.

וַיְשַׁלַּ֥ח אֶת־הַיּוֹנָ֖ה מֵאִתּ֑וֹ לִרְאוֹת֙ הֲקַ֣לּוּ הַמַּ֔יִם מֵעַ֖ל פְּנֵ֥י הָֽאֲדָמָֽה׃

Also he sent forth the dove from him, to see if the waters were abated from the face of the ground;