Isaiah 40:6

6 A voice says, “Cry out!”
Another asks,
Heb “and he says.” Apparently a second “voice” responds to the command of the first “voice.”
“What should I cry out?”
The first voice responds:
The words “the first voice responds” are supplied in the translation for clarification. The first voice tells the second one what to declare.
“All people are like grass,
Heb “all flesh is grass.” The point of the metaphor is explained in v. 7.

and all their promises
Heb “and all his loyalty.” The antecedent of the third masculine suffix is בָּשָׂר (basar, “flesh”), which refers collectively to mankind. The LXX, apparently understanding the antecedent as “grass,” reads “glory,” but חֶסֶד (khesed) rarely, if ever, has this nuance. The normal meaning of חֶסֶד (“faithfulness, loyalty, devotion”) fits very well in the argument. Human beings and their faithfulness (verbal expressions of faithfulness are specifically in view; cf. NRSV “constancy”) are short-lived and unreliable, in stark contrast to the decrees and promises of the eternal God.
are like the flowers in the field.
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