Numbers 12:15

והעם לא נסע AND THE PEOPLE JOURNEYED NOT [TILL MIRIAM WAS BROUGHT IN] — This honour the Omnipresent showed her as a reward for the single hour she tarried for Moses’ sake when he was thrown into the river, as it is said, (Exodus 2:4) “And his sister placed herself afar off (i. e. she waited) [to know what would be done to him]” (Sotah 9b).

וַתִּסָּגֵ֥ר מִרְיָ֛ם מִח֥וּץ לַֽמַּחֲנֶ֖ה שִׁבְעַ֣ת יָמִ֑ים וְהָעָם֙ לֹ֣א נָסַ֔ע עַד־הֵאָסֵ֖ף מִרְיָֽם׃

And Miryam was shut out from the camp seven days: and the people did not journey until Miryam was brought in again.