Integrity of the Scripture: Believing the Qur'an and avoiding worldly corruption.
They were ordered to believe the Qur'an as it confirmed their own scripture and to avoid compromising divine signs for any 'small price' of this world. Never compromise faith for profit. The 'small price' today is compromising ethics in business, misleading clients, or accepting injustice for money. Maintain the integrity of your belief regardless of the worldly cost.