14:5a

And no lie was found in their mouths: This is a Hebrew idiom that means “They did not tell lies.” For example:

They never tell lies (Contemporary English Version)

14:5b

There is no conjunction between 14:5a and 14:5b. Here this grammar probably indicates that 14:5b is a more general statement than 14:5a but with a similar meaning. The repetition emphasizes the shared meaning. Some languages use other words to emphasize the meaning. For example:

indeed,…
-or-
for certain…

they are blameless:
This clause indicates that the behavior of the 144,000 was without fault. Other ways to translate this word are:

without fault (King James Version)
-or-
they do not have any sin

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