'Earnestly' in the Bible

She made a vow, saying, “O Lord of hosts, if You will indeed look on the affliction (suffering) of Your maidservant and remember, and not forget Your maidservant, but will give Your maidservant a son, then I will give him to the Lord all the days of his life; a razor shall never touch his head.”

And so then, listen to their voice. However, you must earnestly warn them; you must explain to them the custom of the king who will rule over them."

If thy father at all miss me, then say, David earnestly asked leave of me that he might run to Bethlehem his city: for there is a yearly sacrifice there for all the family.

And Jonathan answered Saul, David earnestly asked leave of me to go to Bethlehem:

that this [incident] will not cause grief or [bring] a troubled conscience to my lord, both by having shed blood without cause and by my lord having avenged himself. When the Lord deals well with my lord, then remember [with favor] your maidservant.”