وَمَآ ءَاتَيْنَـٰهُم مِّن كُتُبٍ يَدْرُسُونَهَا ۖ وَمَآ أَرْسَلْنَآ إِلَيْهِمْ قَبْلَكَ مِن نَّذِيرٍ Qur’an Saba (34:44)Wama ataynahum min kutubin yadrusoonaha wama arsalna ilayhim qablaka min natheerin
Lit., "which they could study", i.e., in support of the blasphemous beliefs and practices inherited from their ancestors. Cf. 30:35 , which expresses a similar idea.
The ancestors (as in the case of the Arabs of the Times of Ignorance) had received no revelation of the clear kind which a messenger and a Book bring them. This is a reason for welcoming, not for rejecting new Truth.