1 Corinthians 15:58

58ThereforeὭστε,brothersἀδελφοίof meμουbelovedἀγαπητοί,steadfastἑδραῖοιbeγίνεσθε,immovableἀμετακίνητοι,aboundingπερισσεύοντεςinἐνtheτῷworkἔργῳof theτοῦLordκυρίουalwaysπάντοτε,knowingεἰδότεςthatὅτιtheὁtoilκόποςof youὑμῶνnotοὐκisἔστινin vainκενὸςinἐν[the] Lordκυρίῳ.

Therefore, my beloved brothers, be steadfast, immovable, always abounding in the work of the Lord, knowing that your⁺ labor in the Lord is not in vain.