The most common way to say this in an emergency is hatsilu! (הצילו)
If you are asking a person for non-emergency help:
beh-ezraht hashem (בעזרת ה׳)
In Hebrew Ariel means Lion of God.
nes hashem (× ×¡ ה׳)
ha'am hanivchar (העם ×”× ×‘×—×•×¨)
eifo hashem? (?איפה ה׳)
Elohim noshem
your god your god = elohecha elohecha (אלוקך אלוקך)
Hebrew doesn't have a subjunctive mood, but instead you could say "God is glorified," which is Hashem nehedar (ה׳ × ×”×“×¨)
In Hebrew? In Biblical Hebrew it would be Elohenu Eloah ehadh. Or you could say the Shema which is Sh'ma Yisrael Adonai Elohenu Adonai Ehhadh.
eved hashem (עבד ה׳), which also means "servant of God" (in Hebrew, there's no distinction between slave and servant).
God is with us = "ha shem imanu" (ה׳ ×¢×ž× ×•)
rahk hashem (רק השם)