Mark 11:25

23 “Truly I tell you that if anyone says to this mountain, ‘Be lifted up and thrown into the sea,’ and has no doubt in his heart but believes that it will happen, it will be done for him.

24 Therefore I tell you, whatever you ask for in prayer, believe that you have received it, and it will be yours.

And when you stand to pray, if you hold anything against another, forgive it, so that your Father in heaven will forgive your trespasses as well.”

27 After their return to Jerusalem, Jesus was walking in the temple courts, and the chief priests, scribes, and elders came up to Him.

Do read the surrounding verses too, because the context often says more than a single verse.

Compare

BSB
And when you stand to pray, if you hold anything against another, forgive it, so that your Father in heaven will forgive your trespasses as well.”
KJV
And when ye stand praying, forgive, if ye have ought against any: that your Father also which is in heaven may forgive you your trespasses.
WEB
Whenever you stand praying, forgive, if you have anything against anyone; so that your Father, who is in heaven, may also forgive you your transgressions.
ASV
And whensoever ye stand praying, forgive, if ye have aught against any one; that your Father also who is in heaven may forgive you your trespasses.
DARBY
And when ye stand praying, forgive if ye have anything against any one, that your Father also who is in the heavens may forgive you your offences.
BLB
And when you⁺ stand praying, if you⁺ have anything against anyone, forgive, so that your⁺ Father who [is] in the heavens may also forgive you⁺ your⁺ trespasses.”
ÅB
Og når dere står og ber, og dere har noe imot noen, da tilgi ham det, for at også deres Far i himmelen skal tilgi dere deres overtredelser!
OTB
Og når dere står og ber, hvis dere har noe imot noen, tilgi dem, slik at deres Far i himmelen også kan tilgi deres synder.»
B1930
Og når I står og beder, og I har noget imot nogen, da forlat ham det, forat også eders Fader i himmelen skal forlate eder eders overtredelser!

Study notes (Tyndale)

Original text and word study

Cross references