The Quran

۞ قالَت رُسُلُهُم أَفِي اللَّهِ شَكٌّ فاطِرِ السَّماواتِ وَالأَرضِ ۖ يَدعوكُم لِيَغفِرَ لَكُم مِن ذُنوبِكُم وَيُؤَخِّرَكُم إِلىٰ أَجَلٍ مُسَمًّى ۚ قالوا إِن أَنتُم إِلّا بَشَرٌ مِثلُنا تُريدونَ أَن تَصُدّونا عَمّا كانَ يَعبُدُ آباؤُنا فَأتونا بِسُلطانٍ مُبينٍ

Muhammad Asad

Said the apostles sent unto them:¹ "Can there be any doubt about [the existence and oneness of] God, the Originator of the heavens and the earth? It is He who calls unto you, so that He may forgive you [whatever is past] of your sins and grant you respite until a term [set by Him is fulfilled]."² [But] they replied: "You are nothing but mortal men like ourselves! You want to turn us away fromwhat our forefathers were wont to worship: well, then, bring us a clear proof [of your being God's message-bearers]!"

Lit., "their apostles".
I.e., "until the end of your life in this world". This is, I believe, an indirect allusion to the calamities which are bound to befall, even in this world, "those who are bent on denying the truth" (see the last paragraph of 13:31 and the corresponding note 57) - implying that they who consciously respond to the call of God, conveyed through His prophets, would be immune to this kind of suffering and would be graced with abiding spiritual happiness (cf. 13:29).