Malachi 3:14

You have said, '[It is] useless to serve God! What [is the] gain if we keep his requirements, and if we walk as mourners {before} Yahweh of hosts?

Isaiah 58:3

'Why do we fast, and you do not see [it]? We humiliate our soul, and you do not notice [it]?' Look! You find delight on the day of your fast, and you oppress all your workers!

Zephaniah 1:12

And it shall be [that] at that time I will search Jerusalem with lamps, and I will punish the men {whose senses are dulled from drinking}, who say in their hearts, 'Yahweh will not do good, nor will he do evil.'

Job 21:14-15

And they say to God, 'Turn away from us, for we do not desire to know your ways.

Job 22:17

[Those] who said to God, 'Turn away from us,' and 'What can Shaddai do to us?'

Job 34:9

Indeed, he says, 'A man does not profit when he takes delight in God.'

Job 35:3

If you ask what it profits you: 'How do I benefit {by refraining from my sin}?'

Psalm 73:8-13

They mock and speak maliciously of oppression; they speak [as though] from on high.

Joel 2:12

"And even now," {declares} Yahweh, "return to me with all your heart, with fasting, and weeping, and wailing."

Zechariah 7:3-6

saying to the {priests of the house of Yahweh of hosts} and to the prophets, "Should I mourn in the fifth month and keep myself separate as I have done for these many years?"

James 4:9

Lament and mourn and weep! Let your laughter be turned to mourning, and your joy to gloominess.

Treasury of Scripture Knowledge

Summary

Ye have said, It is vain to serve God: and what profit is it that we have kept his ordinance, and that we have walked mournfully before the LORD of hosts?

Bible References

It is

Job 21:14
And they say to God, 'Turn away from us, for we do not desire to know your ways.
Job 22:17
[Those] who said to God, 'Turn away from us,' and 'What can Shaddai do to us?'
Job 34:9
Indeed, he says, 'A man does not profit when he takes delight in God.'
Job 35:3
If you ask what it profits you: 'How do I benefit {by refraining from my sin}?'
Psalm 73:8
They mock and speak maliciously of oppression; they speak [as though] from on high.
Isaiah 58:3
'Why do we fast, and you do not see [it]? We humiliate our soul, and you do not notice [it]?' Look! You find delight on the day of your fast, and you oppress all your workers!
Zephaniah 1:12
And it shall be [that] at that time I will search Jerusalem with lamps, and I will punish the men {whose senses are dulled from drinking}, who say in their hearts, 'Yahweh will not do good, nor will he do evil.'

And that

Isaiah 58:3
'Why do we fast, and you do not see [it]? We humiliate our soul, and you do not notice [it]?' Look! You find delight on the day of your fast, and you oppress all your workers!
Joel 2:12
"And even now," {declares} Yahweh, "return to me with all your heart, with fasting, and weeping, and wailing."
Zechariah 7:3
saying to the {priests of the house of Yahweh of hosts} and to the prophets, "Should I mourn in the fifth month and keep myself separate as I have done for these many years?"
James 4:9
Lament and mourn and weep! Let your laughter be turned to mourning, and your joy to gloominess.