Doubt: It is to be compliant with what causes him to fall into doubt along with suspicion. The meaning is that they believed, then there was no doubt in their souls regarding what they believed in, nor suspicion against those who affirmed it and acknowledged that the truth is from Him. If you say: What is the meaning of 'then' here, while the delay and lack of doubt should be concurrent with faith because it is a description of it, as you have indicated that faith conveys the meaning of trust and reassurance, the essence of which is certainty and the absence of doubt? I say: The answer is in two ways. One is that one who has found faith may be confronted by Satan or some misguiders after the heart has been calmed, causing him to doubt and casting into his heart what undermines his certainty, or he may look with an unsound perspective that leads him to doubt, then he persists in that, stubbornly refusing to seek an exit. Thus, the true believers are described as being far from these calamities. An example of this is His saying: 'Then they remained steadfast.' The second is that certainty and the removal of doubt, since they are the essence of faith, are mentioned separately after the mention of faith, indicating their significance, and the conjunction with the word of delay implies their establishment over prolonged times, fresh and new. And striving: it may refer to the one striving against the enemy, the fighting adversary, or Satan, or desires, and it may be an intensification of effort. It is permissible that the striving of the self refers to warfare, and it encompasses all acts of worship. And the striving with wealth: like what Uthman may Allah be pleased with him did in the army of hardship, and it includes zakat and all that pertains to wealth from acts of righteousness where a man exerts himself with his wealth for the sake of Allah, the Most High. Those are the truthful ones who have been truthful in their saying, 'We have believed,' and they did not lie as the Bedouins of Banu Asad lied. Or they are those whose faith is a faith of truth, genuine faith, and steadfastness.