A. Yusuf Ali:Translation:
Those who believe say,(4843) "Why is not a sura
sent down (for us)?" But when a sura of basic or
categorical 4844 meaning is revealed, and fighting is
mentioned therein, you wilt seest those in whose
hearts is a disease 4845 looking at you with a look
of one in swoon at the approach of death. But more
fitting for them4843 The men of faith and loyalty are eager and anxious to get a command to
serve the Cause even if it be at the sacrifice of their lives. Not so the Hypocrites,
"those in whose hearts is a disease". They are mortally afraid as mentioned below.

Muhammad Asad:Translation:
NOW THOSE who have attained to faith say, “Would that a revelation [allowing us to fight] was bestowed from on high!” 25 But now that a revelation clear in and by itself, 26 mentioning war, has been bestowed from on high, thou canst see those in whose hearts is disease looking at thee, [O Muhammad,] with the look of one who is about to faint for fear of death! And yet, far better for them would be
4844 Cf. 3:7, and n. 347. The defence of truth and righteousness at all sacrifice, when a definite and categorical command issues from Amir al Mu'minin is a fundamental condition of enlistment in the cause of Allah. It is true that Punishment and Judgement belong to Allah alone; but our mettle and fidelity have to be tested, (see verse 4 above), and Allah uses human agency in human affairs. (R).
4845 Cf. 2:10 . The disease is hypocrisy, disloyalty to the Cause, want of courage and of the spirit of self-sacrifice, want of true understanding.