2 Samuel 21:15

Now when the Philistines were at war again with Israel, David went down and his servants with him; and as they fought against the Philistines, David became weary.

2 Samuel 5:17

When the Philistines heard that they had anointed David king over Israel, all the Philistines went up to seek out David; and when David heard of it, he went down to the stronghold.

2 Samuel 5:22

Now the Philistines came up once again and spread themselves out in the valley of Rephaim.

Joshua 14:10-11

Now behold, the Lord has let me live, just as He spoke, these forty-five years, from the time that the Lord spoke this word to Moses, when Israel walked in the wilderness; and now behold, I am eighty-five years old today.

2 Samuel 5:25

Then David did so, just as the Lord had commanded him, and struck down the Philistines from Geba as far as Gezer.

1 Chronicles 20:4

Now it came about after this, that war broke out at Gezer with the Philistines; then Sibbecai the Hushathite killed Sippai, one of the descendants of the giants, and they were subdued.

Psalm 71:9

Do not cast me off in the time of old age;
Do not forsake me when my strength fails.

Psalm 71:18

And even when I am old and gray, O God, do not forsake me,
Until I declare Your strength to this generation,
Your power to all who are to come.

Psalm 73:26

My flesh and my heart may fail,
But God is the strength of my heart and my portion forever.

Ecclesiastes 12:3

in the day that the watchmen of the house tremble, and mighty men stoop, the grinding ones stand idle because they are few, and those who look through windows grow dim;

Isaiah 40:28-30

Do you not know? Have you not heard?
The Everlasting God, the Lord, the Creator of the ends of the earth
Does not become weary or tired.
His understanding is inscrutable.

Jeremiah 9:23-24

Thus says the Lord, “Let not a wise man boast of his wisdom, and let not the mighty man boast of his might, let not a rich man boast of his riches;

1 Peter 1:24-25

For,
All flesh is like grass,
And all its glory like the flower of grass.
The grass withers,
And the flower falls off,

Treasury of Scripture Knowledge

Summary

Moreover the Philistines had yet war again with Israel; and David went down, and his servants with him, and fought against the Philistines: and David waxed faint.

Bible References

The philistines

2 Samuel 5:17
When the Philistines heard that they had anointed David king over Israel, all the Philistines went up to seek out David; and when David heard of it, he went down to the stronghold.
1 Chronicles 20:4
Now it came about after this, that war broke out at Gezer with the Philistines; then Sibbecai the Hushathite killed Sippai, one of the descendants of the giants, and they were subdued.

And david waxed faint

Joshua 14:10
Now behold, the Lord has let me live, just as He spoke, these forty-five years, from the time that the Lord spoke this word to Moses, when Israel walked in the wilderness; and now behold, I am eighty-five years old today.
Psalm 71:9
Do not cast me off in the time of old age;
Do not forsake me when my strength fails.
Psalm 73:26
My flesh and my heart may fail,
But God is the strength of my heart and my portion forever.
Ecclesiastes 12:3
in the day that the watchmen of the house tremble, and mighty men stoop, the grinding ones stand idle because they are few, and those who look through windows grow dim;
Isaiah 40:28
Do you not know? Have you not heard?
The Everlasting God, the Lord, the Creator of the ends of the earth
Does not become weary or tired.
His understanding is inscrutable.
Jeremiah 9:23
Thus says the Lord, “Let not a wise man boast of his wisdom, and let not the mighty man boast of his might, let not a rich man boast of his riches;
1 Peter 1:24
For,
All flesh is like grass,
And all its glory like the flower of grass.
The grass withers,
And the flower falls off,